Malicious PDF — malware analysis report

Static analysis result for SHA-256 2812d682c2f1fab0…

MALICIOUS

PDF

85.7 KB Created: 2021-06-27 02:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6ff892860848f71fd757493e2e21308e SHA-1: 72fb5530c0b53cba5caca88f9983af645378f560 SHA-256: 2812d682c2f1fab072c32b6919b03046adbc01392ae4f09c0fece027ae531407
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. This suggests an attempt to distribute malicious content or engage in phishing by leveraging these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://seednseed.com/admin/fckfiles/file/810171275.pdf In PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/4e8e651d8fbc28f8f08facdbae62c47d/85444278504.pdfIn PDF document text
    • http://www.asslar.de/downloads/resusasebelelelataza.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bc594a460---84246228954.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1089f7ebb54f58e208ad5bd50ff5bf3d/99669449546.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/e42db0718b75493cc3fe290424c25b55/gabufunuvugamezalaw.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/47900057300.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/puzekavifejegiw.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8dc9c29d8---20620140860.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/fawokovi.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/7561174189.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd8f6c14d8---77510734563.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608084946ab7b---bilupexozox.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ejmahbecenbuuh1oct5qcn1j21/sitipekipifurujoxoraxezax.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072559a9d9c1---17733031136.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/rlitd3hpp4gb2evufkcckamrb2/juwibosarilapeja.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/1f2277c9ed9735b2314218d8954e91fd/wofajugujolelitiduzavane.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/8852684010.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/lopatozuwemixet.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/60ec556e2c30b722db3b9dcb678dd1d2/99402902302.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/n8fn033ohfj9tvkriuk9mqohpc/93624400000.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/rk20m8829tidlpq3tmime0als1/35257420760.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8826eddc4---bizetinubuxapebiwukexubo.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/da6f1a4c833bfe0167bf6d159e51f412/pitimerigamebitizalizos.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/4884732867.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/7dd03138da4947d09b95fa7084a9aaaf/rivodakojugojanisusisidet.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608750cad67f5---26140914444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=english+result+upper+intermediate+workbook+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22E 11240 bytes
SHA-256: 653ceaf72a6764e2b02b48d1c28a9d812d0ab3eb1a047ba271d16453670aa3f2
font_01_sfnt_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 17332 bytes
SHA-256: 8c45a663657f47dbb86fdf9068117d8495a57135f4588812162e9c69bc97161f
font_02_sfnt_off00011817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13028 16372 bytes
SHA-256: 6e4f3e4681f034c895ed5091344e8ed4d27d5ee6ae97768e8e34de763aa85d06