Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f194f7bfd8f4d6…

MALICIOUS

PDF

70.0 KB Created: 2021-09-08 14:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a42153cc88dc9521fbb7cd9f4db5ea2 SHA-1: 27a4a0d7f68a944e408ac849f2abfcc0ef405867 SHA-256: 63f194f7bfd8f4d6d779b183307d656086dbc4c952cf50afc7a737b979e3ba18
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is part of a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body is unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a pattern of redirecting users through potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.htlexpress.com/ckfinder/userfiles/files/lojudasizu.pdf In PDF document text
    • http://ecohost.ru/pics/images/file/kemijulabulumejuw.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/xituxejiziduk.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/vofixazasexutukidazuloni.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/72329708008.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/10417549.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/vewoparid.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/86670574167.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c9424c18f---bubozelilezezujoxarepixap.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/belexijubipu.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/88bu8gg1dpv72o13aatr7dn5qi/pitex.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/54044196333.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/fokulegobozat.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/69883391113.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/67979083350.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/b58a13be3856a528680953054736f57d/xufesedo.pdfIn PDF document text
    • http://www.polni.si/Images/files/kuniwaxuvog.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/2e0ed3bb12d0ed90b99c545a46ab7025/80212788606.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/74936653113.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613371b309c73---94891248167.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/9s53ilq8jtqddqvbqo9j7javr7/17008886347.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/karine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=relation+between+roots+and+coefficients+of+polynomial+equations+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_off0000aff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80A 15428 bytes
SHA-256: 774abbcde91ca536211cb4f1de75650700a15f88381c0abed614ccc07898028c
font_02_sfnt_off0000ef01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 11412 bytes
SHA-256: d8eea8b640d550525f4e0762a85be8f0f5f7d2a851b1fc44648e7ae956d044cd

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