Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab81491db2fa66ed…

MALICIOUS

PDF

74.7 KB Created: 2021-06-12 10:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 76535e043a8d839b2cad24fbbb13e005 SHA-1: 9fb155a67d91d938b6f7c4cd1a7ed15a9e72a3cf SHA-256: ab81491db2fa66edfd56138bf22c73d529b6d9fd0c6afbbfd0218a25f104452a
216 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document's content, though heavily obfuscated, appears to be a lure for a "Windows 7 ultimate key generator free", directing users to external URLs. These URLs are part of a link farm hosted on compromised WordPress sites and disposable domains, suggesting an attempt to trick users into downloading further malicious content or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://oniceh.ru/uplcv?utm_term=windows+7+ultimate+key+generator+free PDF link annotation
    • http://cnex.cc/images/blog//file/zozulutakerajitil.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/bd032fb005e7f13be5d1998e6ed845dc/burexufolufokejot.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d057f36267554aa35f0e1dcdd3a38578/3981639836.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/88196764384.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba75dd39033---tamamoxudisebotosibogewi.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/c32f7b4685a488a385c1255de2142a02/59531010501.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af77af54b85---33626702797.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/5en2u6tanjde2d8026sep940dl/21491974047.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/43518117014.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b400933a7---tadipot.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/361d9c0448b73162dccb42c3116d54d6/57418713559.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ro654i2tqp3em9udejkkjng99a/69197707821.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/60280597252.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/11308915035.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a07aa1af6---25389335866.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/80255859829.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079092025aa4---mosijizofosijep.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_off0000e380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 5580 bytes
SHA-256: 839521d340120d52efde1e5b616f70d6fa7cf873d8f97a48f2c6d199cfbd05f7
font_01_sfnt_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 11444 bytes
SHA-256: 481cf361e4e944b86138f0ab4f79cb0720d3fe1e02061152d86472dbb6138edf

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