Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6182a3d47083d02…

MALICIOUS

PDF

99.5 KB Created: 2021-07-30 21:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d375df3f24d903f1aa0d91509d3735e2 SHA-1: 80eaa52f66f471cb820530c99f333ad297a46ca5 SHA-256: f6182a3d47083d02d4a7b1d5d0d162db44cb351254e865dd5694f86f1d7a1674
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised or disposable domains, suggesting a link farm designed to distribute traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but the structure and heuristics point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://altinay-law.com/images/file/tunavimolufexiz.pdf In PDF document text
    • http://envigest.cz/upload/file/54337905568.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/webiriderugu.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a30d8e827e5---80016107366.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/xusotuxobamabatew.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/fegiduzuxegoxowuporalo.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/vgt6049bkknfi081e5qiuqr6r6/xoxamekawewawefalase.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/66958774852.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab5334b314---sazetedil.pdfIn PDF document text
    • https://melz-feu.ru/upload/94828080046.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/rimepitepanodol.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/62898202287.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/muxidezal.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/93262598481.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160736c1e9b3fc---jibugijafaniwomefuduwu.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/21109573030.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/giwutepew.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077518c27310---gopepidakubobexexun.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c48ff20cd---23986005785.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/ruzovageloragos.pdfIn PDF document text
    • http://crm333.com/documentos/file/rejajuvoxijizizib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gastroenterology+clinical+focus+pdfPDF link annotation
    • 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_off000121a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A4 11048 bytes
SHA-256: a1d1cf867006b338839e4ed980d11c834406b2ae1942e8eb438543cfefa32bb9
font_01_sfnt_off00013b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B58 17032 bytes
SHA-256: c8829f5ce0f3f1c79933192208e7ff52089878f115331e8c3fde10c506399bfc
font_02_sfnt_off000167db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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