Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e433b39b806a72…

MALICIOUS

PDF

84.4 KB Created: 2021-09-03 08:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 518e6eacab3f56eed365335b3aae1002 SHA-1: 255796614a324f1c46b33562f48fca2700edc101 SHA-256: d7e433b39b806a7260c2766af021436d33465a3d180a63f303d55b6a3f7a1cd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains numerous external links, many of which point to compromised WordPress upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://huntic.ru/uplcv?utm_term=how+to+cite+pdf+from+internet PDF link annotation
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97bb33dcad---83053124311.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210823151210.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/dutolexaze.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/54231369291.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/rusitukidakaririxabamis.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/0e1olunqoca72h991262qj644h/rebosele.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/37k6oobb30ja4bbu659i7n57lq/vibagawa.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/13117714159.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/pednbad8hv383ui2dvi6r82rug/81618169463.pdfIn PDF document text
    • http://beateromer.com/bilder/file/lepajasifagofisazo.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/33648076894.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-5/20210605114307476931.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121744437624---10895269991.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd86f3ec4c---lereg.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/36614098990.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/86125110385.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/12588107070.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/wopoxemewad.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/turewakogonewebaresimes.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dae9130b6---54761745839.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608115f981d66---8682113324.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/latibijalap.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_off0000e2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB6 19232 bytes
SHA-256: 86bbb9a8f9e2d5974c050692cb041f3bf17c630bb1a6eadb015e7311c428a59a
font_02_sfnt_off00012c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5C 10480 bytes
SHA-256: 626d0448d1651f642cc8d82adeae4bd510f85ff40085cb2785fe9925d7be4003

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