Malicious PDF — malware analysis report

Static analysis result for SHA-256 991459f60c0a0e0c…

MALICIOUS

PDF

98.7 KB Created: 2021-06-21 13:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e7d5837d80685bdb123f428953f05c03 SHA-1: ea93ddd636810df96e9ac95efabb6dbbc5d2edd6 SHA-256: 991459f60c0a0e0c7b59f23fbd2cfecb6cd7f4e76cb6ff8e002485e68233d04d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://krisoc.ru/uplcv?utm_term=kris+x+lancer PDF link annotation
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b371f360718---gukutibakabarul.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4682dfb4d---fifasoba.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/18960845870.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160796f7338d7c---zenomajizipizelovejuj.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/n3c6hibei8rvbbpoph2eps6g86/66300643283.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/dasawolunexewerogu.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/96585184128.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/wevowovuxevikubudurino.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6ab206a2a---pafez.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/o6q8gkr5vap5f9ia1nens9rf8o/vixuno.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/37700749722.pdfIn PDF document text
    • http://strandedtattoo.net/file/19088773828.pdfIn PDF document text
    • http://momsystem.ru/public/file/77924250922.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/42d426982c86bd7f423f55a40a2cac2c/tiveti.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file/%5C/xanezugidozo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001154d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154D 7644 bytes
SHA-256: b6699f843c62167987ba890e99f1ff3ae528c532b552254aca33240c540a99bb
font_01_sfnt_off00012f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6B 4832 bytes
SHA-256: 68e8e50e2cd9594730cd0557df7c1f4a6580578aec48518debc01ef7057e90b0
font_02_sfnt_off00013fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEF 12200 bytes
SHA-256: ba839e3c98eba952da3e8e0f3d74dfe0e8917d9f227f76b5e4df7297324f8828
font_03_sfnt_off000168fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168FD 16080 bytes
SHA-256: 99dc80f4e35ecbd485aec20692fae4feb9ee2895e9102f631d55a3222af1d7fe