Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a9f774937dd559…

MALICIOUS

PDF

73.4 KB Created: 2021-09-06 05:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 28ff90b813417572d8bb81c85f11ecb2 SHA-1: 8f7235c9b064becaa059f5037e9bc89760d14477 SHA-256: d5a9f774937dd559bfd01882ea7427f3c291b338ea33e14488b85953cd746648
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=wellness+center+business+plan+pdf PDF link annotation
    • http://suurelepa.ee/data/file/jimizigeso.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/85855240048.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/85od5b3fnji4r11d3ecki5s9an/58085775257.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/tifetexaxofari.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/1452316333.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd35a7a3730---34162945242.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071425acf19d---42686968327.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/0b4d1ef372a3126f0e2b78b063731180/63603250221.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/lemexopir.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/ribemiropopiwijitariji.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/45259745677.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/minavar.pdfIn PDF document text
    • http://msiutilities.biz/documents/11709131765.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/d4430d8331687e5a8c05500c7c34bfc9/90794947752.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/sizifufovazijigosenofod.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/kuvedabexapepofujuxebimuz.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3915358747---resadibixeruxeruvome.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/desafoxenemudovagar.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b059d817aec---xufenezapogogutap.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edbfb77baf0---46132065291.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1d4830926---datenapogolebaxadolixe.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16117187d0b6c5---70708532917.pdfPDF link annotation
    • http://esistore.de/userfiles/file/12393621827.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/22210320886.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1cbc88065---zulebelul.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/81947100071.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_off0000c115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC115 15192 bytes
SHA-256: 5d1645994d92fb4c5ac77544bebebcf1d6458e14542a119c90923aeed1d6e9c1
font_01_sfnt_off0000e719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF30 10724 bytes
SHA-256: 301ad12aecd621919449f6d3e5f63e389be610c777860d52e70d949fecde5d18

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