Malicious PDF — malware analysis report

Static analysis result for SHA-256 50abe16cffbb9230…

MALICIOUS

PDF

70.5 KB Created: 2021-10-02 21:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0d7ac35e059f0d05a13c96377a70f0b4 SHA-1: 84e1c6bb31fa4080165a7ad3017e7e3045114466 SHA-256: 50abe16cffbb9230301b90d0e89097868bbc7ebe4dd21d6593f74e556ac1da58
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm its malicious nature, likely exploiting PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=ancient+greek+government PDF link annotation
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/dd0bbb4fcdd866ba9a9be6f87a8bac94/maxagoz.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/fasukez.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/9640537326.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/61933467718.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/pusutewovivekidiz.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/54107714339.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/36610255712.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/jozakuxojipewa.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a2df9de35---jefeparokiludasekeg.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/aeef741735a57d66b9dc3a50773dd4c8/48741015992.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/50769c67c8f16c4c614478482e0ce63e/nametinosefiwegajami.pdfIn PDF document text
    • http://retailcop.ca/files/93329701958.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/pimowavazilow.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/74690386214.pdfIn PDF document text
    • https://terracell.info/images/file/61525727270.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/zaken.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/36887603258.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/12411768900.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/20750121329.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/parazerule.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/suwifedamesilafobozugoze.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/94164635176.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_off0000afdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDF 17920 bytes
SHA-256: 8d77f1c92102eb90139db2c9e55f009b60fa214e214fc5cb621d8caa3bb99360
font_01_sfnt_off0000ddae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAE 10336 bytes
SHA-256: 1d904e5628eba75a5b0b38a01159ad188a7fe90cd33824be529f1763dd5e0f5b
font_02_sfnt_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1