Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb96265607102a0f…

MALICIOUS

PDF

88.6 KB Created: 2021-09-19 14:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 167655a86909179b27b54af3f9b10c1f SHA-1: 556da7a8e40751d07311abb2abd63109874a7ff7 SHA-256: cb96265607102a0f39718b29d7fa649522005f65b5e0dd86a1c32b75a2dfe2ae
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, indicative of a link farm designed to redirect users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The document body is unreadable, but the heuristics and URLs strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://pixomot.ru/uplcv?utm_term=the+last+naruto+the+movie+watch+online+free PDF link annotation
    • https://pet-fashion.ro/mm/file/rafakamowinux.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132309fc55e7---tifomimeponoxovo.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/lofogipifopuxaduvokap.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/24756780498.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/81431291205.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/wetimil.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/jefutifasad.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318c7201611---pupipumug.pdfIn PDF document text
    • https://lazerom.pro/media/file/sorebiwa.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/44453971080.pdfIn PDF document text
    • http://hidramaco.com/files/files/17118031494.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/23842687194.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/49380642711.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-08-14-49-36-43.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/061ba32c0c38a7bd6b3cbd06241ac0a5/tapowonofaraga.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/49442948225.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/78cda946bdce0b9a6936daebb66fc144/jedopimolafajifaku.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/87921665261.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/bumejetuviwibolunowalape.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/46032400591.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613cfbf9b83bf.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/rosezudema.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_off0000f66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66E 17596 bytes
SHA-256: 93b514b35e179da67ac47cd5375de7ed3e564b397fa3f2e3d61ad337e91489e3
font_01_sfnt_off000123a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A4 10816 bytes
SHA-256: 16c685378d41587b5187b5f4de60e09bb8a371faca30b9de357e6f55f72440bc
font_02_sfnt_off00013c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1