Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fea1fa4436967b1…

MALICIOUS

PDF

88.8 KB Created: 2021-08-20 10:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 63713b7dd3bb0a961429ce768f0b8abf SHA-1: 8ad73577590b11d6e7075318712316f29756bb8a SHA-256: 3fea1fa4436967b1e133a6b4acf4ff51c99e5805fb249723ea705340e5dd35ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure itself is also indicative of malicious activity, with heuristics pointing to link farms and potential exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://crewmak.ru/uplcv?utm_term=armitron+45%2F7042+user+manual PDF link annotation
    • http://mail-ex.net/userfiles/file/34548948283.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/polelujujanagovidate.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/379b57d7184f4c64454278e676c79b7c/36316772201.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/wiwojonovexuwuwo.pdfIn PDF document text
    • https://guijek.com/userfiles/file/83488939574.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/4004158402.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/3aa8cbb6ad140ae243a033c0cc04f94e/51900920823.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88f6976f28---48364217219.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d6dc5291284884133f38a8c2630e5527/bogevazonod.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160793265b9ce4---pejovorufepoxewebafudig.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/zefivatavinisefamikuje.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b1fb415b4d---lanobimexameferafo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df9483811e---96224266186.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607662990d705---jorawaxedazogow.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/widari.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb84c95915---20411378546.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc5e82cbcd---navakinaforo.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/62593139007.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/siwir.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/80068281295.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16089a320b6fcc---libegijajodevex.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/suremibonumukesa.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e29a986818---23168871039.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_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 17328 bytes
SHA-256: ca2586613c5b8d05866f4cdabbcd1cd0fd61058c19d9b8de060570b4abd82c93
font_01_sfnt_off000121b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CC 10888 bytes
SHA-256: 25f7a8e0e43eede79ea6c6f059db55f4b2f26f04f0292f3dee38c5e697c481fb

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