Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f3f94639955476…

MALICIOUS

PDF

91.8 KB Created: 2021-08-04 19:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7bb4fb8f55626d1c3caefb5b30544d00 SHA-1: 787139f8dcb1a3d4fd35769c58d3cf814827f8dc SHA-256: 52f3f946399554766e1a51d0d9c9f0f81119dffd25d8e04d78ae990c2b84eb51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inwebjor.ru/uplcv?utm_term=2011+mitsubishi+lancer+evo+gsr+specs PDF link annotation
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1337988759.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/xapajifop.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/jikefiputaf.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/i8io0e8sdtf65cjdd9u5thges4/vetesi.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/97edfbf1f896cf65d13cc5e8dcfeb4ee/84851629824.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831d4a242d0---87100040251.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/82975ff2eed2f2b7a422c97e14a3fb1c/vojofozukomopaliz.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/992e72e9a2b4abd509b3ca8afcf8e915/vogavoravezaxafusowifan.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/16523047812.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/b7fa137f662c7e051a8e3fbba2d3c2b8/66915020136.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df97552d7d8---51663027471.pdfIn PDF document text
    • https://eberli-medical-supply.ch/userfiles/files/velemavuxerow.pdfIn PDF document text
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/fexufinusele.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/biwesagijuxokolidum.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1290596c6---48237772040.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607490f71872d---22996394417.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9f1969b8---45113842094.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/mafasojedepo.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/vexonekigosidenifafize.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0btmpbqh0hpf1a6sh7td7fu9qi/73474818834.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c55030e552---sukewapisabifel.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afda4378ed9---59728497727.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210615135145822977t34tz1.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_off000100ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EC 17548 bytes
SHA-256: 03ac83c89a028d44287bacafcab178352a1f2c4627b9791174e9735d6091b313
font_01_sfnt_off00012e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14632 11324 bytes
SHA-256: 97a2ff4098a39b4bf2d584a48567701cc1945861ba05ca0137bb54fc13089f2f

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