Malicious PDF — malware analysis report

Static analysis result for SHA-256 a582d9ac75cc5f94…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 03:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 14191c217cc5319f094fafaac98c54f5 SHA-1: ad6745052e20f1b8b843ae81a4222407c89f55b4 SHA-256: a582d9ac75cc5f94a0108234a4b455257f3d4452545a3186689fd6fb3f13605b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal numerous links to potentially compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs further supports the attack pattern of luring users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=spanish+language+learning+book+pdf+free+download PDF link annotation
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df210eda110---pilemefokuden.pdfIn PDF document text
    • https://digireg.si/upload/tagiwomazumok.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd3463af4f---49145349258.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b5b6098ec---46348326931.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/losemovidetexe.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/wegifevolab.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/fupofosajulezezalegafigi.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/rulapedesovare.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/sexapapuk.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/rototovasale.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/99219985487.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/kulilagusoxuxexobekilo.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/cdc43c7b634bfa400301c46335938942/vorakogirusijabesomiriwo.pdfIn PDF document text
    • http://agama-rc.com/upload/files/89922536793.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/53qvkfa8ek4c8o6tmr6gvfbuj0/doloxikulefojupe.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/93853bf8c43f5796eff8378585eebd40/tagumezarabebos.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff242a6249---gopemupukumumidopi.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/zikazasiwanorofurokunisun.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/11359120942.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/68957486254.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/020159258376.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/jofowijabumimuwi.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_off0000d5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A4 11172 bytes
SHA-256: 531eab3b9546346abea91dffb88c03179a19a044885db3c5f6c9fe2d2ff41db8
font_01_sfnt_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 17688 bytes
SHA-256: a7609e8fafdc9905a6f8a0f5165f0640a01ab32fe37436a080ed0fc0e1bc482e

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