Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7568b4a89ad7d6…

MALICIOUS

PDF

78.1 KB Created: 2021-07-15 12:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f80413fc101ec7f914c74a6b5d3db49 SHA-1: 1cd77d5125aa989117b279de19dad93cc527b3ff SHA-256: ac7568b4a89ad7d6bd82cbd9a8c15fcb020c5037885d947201ac7f0c365907cb
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and exhibits characteristics of a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains. The PDF's structure and the presence of external links suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4580

Heuristics 5

  • 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
  • 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://huntic.ru/uplcv?utm_term=export+pdf+as+text PDF link annotation
    • http://technocom.pl/editor/file/wisirojaxij.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/pupixax.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/dewofum.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/21251147361.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/df7e73993dbb51a98c72421c81c77fbe/2216690962.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/dfe5614b4c025527af85edbbcfddf8d8/nofuwovabujemi.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ri84buk0gdls2fj5kmnb6prjr4/98738688337.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/87850924622.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/ff0a65a361facfa7d4211051092d7e97/54148265742.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/58485507576.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/2djc7nlk49ldvtbj1cnsmi044p/16212359767.pdfIn PDF document text
    • https://ebooksweb.net/files/file/95038848930.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/kikefanixewev.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-07-08/images/files/50682730731.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b9230f70---seduzamezojemazatodije.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073db27b363b---vetuziwojosutasijen.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e17ae43a6---97956459950.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/11833218760.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/28584363780.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/buwarawid.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/2702662237.pdfIn PDF document text
    • https://wineart.online/userfiles/file/gizanam.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b177102f94---56396552437.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608748e6d84c6---27857828810.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10403 10332 bytes
SHA-256: df85e558a77780d51a37453b828cffdddd31379192d40f5eed0a9304eb13efec

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