Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a37a38c5c3340d…

MALICIOUS

PDF

101.2 KB Created: 2021-09-03 08:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e9d763e717ef035f80c000ecfba72c69 SHA-1: 2fe9934ce86f8ebe3f49e491aea1a5ecb4a490ea SHA-256: f3a37a38c5c3340debcb9311ba2b6da6cee19fc047ff5a6b7b0a45b49c71d659
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic findings strongly indicate a phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://vicareyou.com/userfiles/file/polebugexorodajifemazunu.pdf In PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160d01f7ca3aa9---vasopuriseripajet.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a174f195d5b9404ce08bfd03e8e58204/voxumosifijav.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/b3287d4847a83f209a57f99e81461222/37303648972.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/89833725162.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8f89b75f8---jotopukapijate.pdfIn PDF document text
    • http://usmleworkout.com/files/file/64059816653.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/voturaxowovug.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/musunuzunijuduj.pdfIn PDF document text
    • https://abeess.com/userfiles/file/jowulelivagirilij.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160feb90169a00---3424365920.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/17045207884.pdfIn PDF document text
    • http://www.moyekolodin.com/files/rodizavagumuropit.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16070edf3c301f---savutovosaveremesopuwil.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/27733146161.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/98628946903.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ddb07c94---36631360460.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/punotilo.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc00f38927c---22069924259.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b967e31ad---lazugejukoxeputuberub.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/d9ov5hqn9j1pskn0i1ub5m4ub5/81808922593.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/pafekoxosepobok.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/7c99b983b489c3d5e623352b379c1584/mebokepopib.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079918c37f43---metuxukogatiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=generacion+de+corriente+alterna+pdfPDF 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_off00012111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12111 10484 bytes
SHA-256: e91a7be4fea5d4df3c5f5d3b722a631112d13d5a4561db029549da6f4bf9e467
font_01_sfnt_off000138fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001510f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1510F 21044 bytes
SHA-256: a1be89e15a0e0cd81028e85ad1fd696c1cdc1df990da1a05677ce29bfb014ce6

Open this report in the interactive analyzer, or submit your own file for analysis.