Malicious PDF — malware analysis report

Static analysis result for SHA-256 d267844d19617f23…

MALICIOUS

PDF

102.3 KB Created: 2021-08-10 21:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4c282143f699cbf3f83f0f402d0c5a0 SHA-1: 8221915251972f0bd1ab44bfc957bd7b94426dc9 SHA-256: d267844d19617f23500171cc924284e1da86a3a187b4fbc1f12ab612e2db6aeb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://thingsantiquesla.com/userfiles/files/65841897253.pdf In PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a932405e678---17985059661.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/76788280804.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16074216183d06---9027256516.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/219e7fa2b43476a5c7aa9663f34392f6/94870729426.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/24089265696.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/fijuvamujagutebiriteridix.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/netujafovedenuwuk.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/wigevajuwafulezalisizari.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/zuvepop.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/xonewazituxosujusu.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210520073318.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/nii5aora747jn3m7r99m0fq885/91472100692.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/fb89d42884048116e55effa2a6a100d8/fujupimomufexiririkirik.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/solifubuxi.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f460995e65---47106251068.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/74695724092.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/76974189010.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/felarulinefizivokufejogo.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b242ee51c---vedosexi.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/fusilatibugudogodafajegen.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/14950630169.pdfIn PDF document text
    • https://btegypt.com/file/39673298621.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/fozute.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/nutibapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=hollander+interchange+classic+search+manual+iiiPDF 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_off000126e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E5 10908 bytes
SHA-256: d84abc80bc7b52e96b43848c0926260dd77284abaf5020d4efadc9600f187441
font_01_sfnt_off00013fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA8 18416 bytes
SHA-256: 66cfd8ed3b7e5133ad3817a3b63f53b3346660230398c6dcda6e9cafcb7ab05c
font_02_sfnt_off00016ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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