Malicious PDF — malware analysis report

Static analysis result for SHA-256 a965a040765ffc18…

MALICIOUS

PDF

87.3 KB Created: 2021-06-29 15:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a01755bad82e8e4a6e79d7b96b83d034 SHA-1: e81d278db0e7f2bb5070119cbadc603b2b3e4f71 SHA-256: a965a040765ffc1823b2bd20b98f4f8cd6be203f34f3df21c96e5b7dece250b1
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to host malicious files. The presence of a 'Clipboard command execution lure' heuristic indicates the document likely instructs the user to copy and paste commands into a shell, a common technique to execute downloaded payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chcial.ru/uplcv?utm_term=pdf+extractor+software PDF link annotation
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b265efec1f2---xumisurutuxur.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/3p5oc92csp1mr6vm4al3a980n3/rofavonugasavavakisejo.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/87902854672.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608202c32919d---tuzekafatibezal.pdfPDF link annotation
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/66ce44f07a6ebd2e38d1c0b97830a8de/89364949220.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/74594e40d7a9b78d6724f76285fad260/47600079018.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd501151cd---fogesaju.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/vazes.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/fd57cd2c6b14169bc4d46ba52a9cdbb3/14243906986.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5a207c60e---pusavipegedisonafif.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/cfd4n1rh856cag8on13bab3pjl/setowagareseruxo.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/72001249933.pdfIn PDF document text
    • http://simonide.org/userfiles/file/kufezilufarikugadibej.pdfIn PDF document text
    • https://alutat.com/data/file/21157495721.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9f838c93090f3b361514e7b58da16417/48573733562.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cbe00797f---jojelajiguzutigezogajono.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/guwadadixe.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160950818cc133---befivorev.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16070c62f2b701---sedabof.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/9lvh1vn6r04bg5peinlk4tvkr5/93554006532.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/15833748993.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860189df6e6---rujikidetaf.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079a42fa00eb---81515299518.pdfIn PDF document text
    • http://geotersrl.it/file/jasafitom.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609424d626715---ruwofukunofofikamolexe.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b68f983a724---mutifoporimajagasixim.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 10416 bytes
SHA-256: c6becaad39a1f0d72f6645a00fe8411249efc97ad5348db111ef6acaced39a2f
font_01_sfnt_off000106c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C3 18868 bytes
SHA-256: a67b209c403d5fd8d13d507a4807c3c1778923310141e54b47813e88c064c93f
font_02_sfnt_off00013827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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