Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb3be8f7b038c9c…

MALICIOUS

PDF

76.0 KB Created: 2021-09-04 16:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf35dc9e178aed49b53e89e04d53c578 SHA-1: b4fb6e4ae0fb218ab9286c1fe7fcc9e934a1a9b8 SHA-256: bcb3be8f7b038c9c875261f2166d8c8683e6ca44224bc0f4547a362396750351
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or hosting malicious content. The presence of external URIs and link farms suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=nitro+pdf+download+free+full+version+with+crack PDF link annotation
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/vibatewolorunoruporuke.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c2de4abf3---noferodujuzo.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/xapuvokibaterakefazunidiw.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/dekofifumet.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/45313163167.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/nibupobubunapomu.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/30851fb13d05b9d3f0a4ade69d0fb21f/9364436883.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/dajulakidorizivawofitan.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/rdkh0f3cijk5pa75jtkq9qgcht/tigutepolarexamonidila.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45c43a7568---tosomanafeteb.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/87578576630.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/bepiwemewexaj.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/73c2c52c04eddb064ba36b63d3d0b5be/91291512568.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/53766040158.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160756d12035ab---dufiwusisogokotekilewexad.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/tizudatirolutizekev.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607690d1639e7---90931650210.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/31738136245.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/7505cf44c8f5d9729ac3ecaba55b0213/80117269535.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/30301523096.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/kutotavegimugatemujine.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/58368189454.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/wifelaxuse.pdfIn PDF document text
    • http://slsnn.ru/content/file/83431241207.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_off0000c344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 17400 bytes
SHA-256: e0ae4916149756e3403d8577f74834fa3d282591da52b55b7e3e0b3dd3d8a05e
font_02_sfnt_off0001083e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083E 11036 bytes
SHA-256: 96465bd511e3a7337c6626ef27a611abd0b7db5bf3032bea3d24649768868f1a

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