Malicious PDF — malware analysis report

Static analysis result for SHA-256 053524370dafa208…

MALICIOUS

PDF

89.5 KB Created: 2021-09-06 10:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 36d9b770570e1fc892733ab9b6412c9f SHA-1: 43511451e1c50a72b11ecb731320a2007b39c82e SHA-256: 053524370dafa20809f2d67a3b04140b896f1a125970d426b25672d774994f59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous URLs pointing to potentially compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://huntic.ru/uplcv?utm_term=qu%27est+ce+que+le+tiers+etat+sieyes+pdf PDF link annotation
    • http://fanti-fitness.pl/uploads/assets/file/kasobifatuvirak.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098aef8520db---rarowuve.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/89404925764.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/vefefinukasezoliwinebexi.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/11426412257.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/nonigugowigowekonelure.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c6ad845e3f53b4e4bcd8bf3e0812bedd/norizuz.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/bodememi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160846a0e379c2---91842318508.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/61873158766.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161328a40366c4---sudalik.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e929683e6---xijodufosomamu.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611d5e521eb8c---71885247525.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/tatepexobam.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076bfc43ac16---titosidokok.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/dazutafofuwudolipivaxe.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/vovn6guper4se27ncs3r9udg69/jurenoxekukexalugu.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160871e66e0cde---61034726181.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/gimerizanevozasaxibobowi.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/8ov87lajsatrqjkn94g31tjkdb/19212108989.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/86009787604.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609003412b511---dixarodorigelosogulosen.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_off0000efa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 21980 bytes
SHA-256: ab2d181e23885da412710b493a79f63e1a22b9df57da06ef9023467b4847032c
font_02_sfnt_off00013f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F05 10844 bytes
SHA-256: 2a579432690cbf8695f2ee0c413e63f72267cd0fc20b0958aa1d992e6c8096e4

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