Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8f59c5b1cd8fb6…

MALICIOUS

PDF

117.0 KB Created: 2021-08-20 12:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4f3e23aa5a7b6ad3c501939559e50913 SHA-1: 212d3fa96c0bbe96e4a3eccd03a268296b500dbf SHA-256: 6a8f59c5b1cd8fb6ff1dbdcf30d892866d7bfd369f0d27b12f4b88319a28fced
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable binary data, offering no direct clues to the user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://archism.ru/uplcv?utm_term=animales+fantasticos+2+wiki PDF link annotation
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607040e93ed35---28030145347.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/14072702329.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/vagekewudagivilab.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/61c16a1ded497516e777317e3a022b8a/86611925294.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/95917681288.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/533e5078ae6ecba3f0f805d5a11e94c3/mitugabidaj.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b0a040552---86353787929.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fb54810356a---mezidatetarexaxogevixi.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/20ro1omgpbcedu2dcac1i3kijr/45740615182.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/49cqhnimdqi09na81m5o0d0q3d/40313629585.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/4728441835.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/11961870407.pdfIn PDF document text
    • http://short-story.ru/upload/file/guvula.pdfIn PDF document text
    • https://aksusu.com/upload/files/82263880434.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/84775041757.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/wuxawujivulazogakitiwi.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/duduwovoperepoj.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/32915656132.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8486a74132---42409307001.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-7-22/20210722022842620242.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/zigefarujikavunevamog.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9abf02b0a---31901247645.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_off0001623f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1623F 10676 bytes
SHA-256: c96a8e05a0d8f72acdc386b6a60c88eb1024905fa46f649fc6a735e78c558da8
font_01_sfnt_off00017ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000192f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192F5 19180 bytes
SHA-256: a19ccf234960af5c32af5cbea3b961bc6aa9a1503f3c673a3025254bddb082b6

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