Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ecb741f4d61eaa…

MALICIOUS

PDF

74.5 KB Created: 2021-09-01 08:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fbbf5a54dc3d9a708d2d1c296ec46401 SHA-1: 3823376dfe7b7a838b7ac4e0687edb2f11316d9b SHA-256: d5ecb741f4d61eaa605a25de93785ce9aa625726e0bf74c9128657fdf835ea53
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://tomaszskiba.com/userfiles/file/pasapamipoxisupog.pdf In PDF document text
    • http://maility.pl/_ADRESuserfiles/file/35665342878.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c98b2f643---97783713203.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/20520980885.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/f1669a296e397da95b598971a0647551/98606510204.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8968a6ade---wezafaxejatorozuno.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f29e761ef---fowilaxubaj.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/64754335215.pdfIn PDF document text
    • http://riversedgefm.com/files/file/61296821140.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/45a84a8b8fd055a4eb5d98ec34c8b0a9/voleripigezekunopa.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/nagumavabemalava.pdfIn PDF document text
    • http://planetamama.ru/files/file/xenajubinavajosesigekul.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/92564807766.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/54350059431.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/e307f3ed4bdbe22b9a19bebaaeceda04/57553994148.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abee8add5c0---12199207807.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/96ef78549c0ad0a3662a8d4d1cebe2a8/28730971941.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083e3a139b04---51513062774.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/5qgn3ctjn8oikc097vvfenlcs2/lusudomiwisemejirisufe.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/195325963.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/62272724872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=free+book+pdf+libraryPDF 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_off0000c1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D1 17040 bytes
SHA-256: a061de2b7e344dec9e86181177be8e7162b78ee418af6ff53fe1625a914649ef
font_01_sfnt_off0000ed7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 10444 bytes
SHA-256: 196bfc1917c06dbd7463ee68fa7e56676ab778305c06013f8aa20bf8afbf5db9
font_02_sfnt_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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