Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08a66878e3e8499…

MALICIOUS

PDF

73.5 KB Created: 2021-06-16 09:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 292521fd7cf3cd5eabdf6b4d32ca99e8 SHA-1: 4b0772d2626d839f5b3b7671316253c8db3873aa SHA-256: b08a66878e3e8499de6b3bd831a4fdb5bd0bc66881a6ab0cd6f6067803e92690
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 a machine learning classifier as malicious, specifically as a phishing or trojan distribution attempt. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains strings related to property access and application details, which are likely decoys or part of the exploit mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nomylo.ru/uplcv?utm_term=accessed+none+trying+to+read+property+ue4 PDF link annotation
    • https://csn-alliance.com/data/files/bewimuwimufukalikati.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/h5liaq3hbb0qrpknim8gof3oa7/98572557973.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e99087d69cbcec57c43a1b350b6acea8/68375132960.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071405962db2---golegutiwupadenepaselitar.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021060218551414.pdfIn PDF document text
    • https://foulardfotografando.it/file/komuxisajukisuri.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/66e1a2badfebea6fedfea74191a23efa/69546543510.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/8913586271.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/4bvj1te8dc03bhf8h7sae7e930/nuvapoberebofogepasoluwu.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/nudager.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/93284316367.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099485f67f29---59600059760.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/807519519.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bf65bf72c---85040265162.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd1b207e12---piwojoguvinabumapebo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9D 5388 bytes
SHA-256: 3e8d1d451ba245095d5f2e64991b8b8f4a3e93d9d104c860a929424825fd7f0b
font_01_sfnt_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 11728 bytes
SHA-256: c8bd086eda4e43c51aa2bda3e42faa2bcdb1a0fe2f00c286a8ba6a480984306e