Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77e7bdca8270b23…

MALICIOUS

PDF

82.6 KB Created: 2021-08-15 17:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4ead474e31611d7166bb1c0764cd2a27 SHA-1: 2ecd71bc68369a2120560fa3f5a641931b1d9eb1 SHA-256: b77e7bdca8270b23016df95cb8560a45f77afb19c4e4ba27ec4e25504862674a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malicious content or phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns suggest it's designed to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b289f9283be---51465228474.pdf In PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/89ff6400758b20159c1b1f9dfab03564/bukizinifuj.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/melugopefaxidu.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/88568879193.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/33401396224.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/cq0abuklvq4f912lk7mfkoab5i/7549019032.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba173f9b8---32294638315.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161118d2e0e1b7---89210455719.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/gt7gpvjlt26cuffg92f1442iiv/zubadipusodurax.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/42419873059.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a1404d60a95---zewevi.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2b49f515bf---92156901310.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/kilolegasesino.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/h1k18brti6mkm6vgd82luqv0oj/29372279922.pdfIn PDF document text
    • http://starsunited.at/upload/files/vogumupi.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/1575716968.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e571a608996ddcae499f17535e7b52e3/45012551552.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/30044628927.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/ramozam.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/66856042177.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/97cd7476d3352e7b5fa9751a2ad10ed2/zazibixe.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7610660595---76918754487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=aisi+4140+annealed+mechanical+propertiesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 17036 bytes
SHA-256: 4efbbbe090431feb534ee516adad6e868621937a772f26a9667ed45c3896d8f5
font_01_sfnt_off00010a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 11012 bytes
SHA-256: a5fa22c9ed4fff5ceb19f815013634a2ce8d84d2fed8e49fa128c58aa92a1912
font_02_sfnt_off000123fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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