Malicious PDF — malware analysis report

Static analysis result for SHA-256 93410a5f80b9d9bb…

MALICIOUS

PDF

69.2 KB Created: 2021-10-04 01:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e0ed8f4c0dcaa968e70b8aeb063f5c17 SHA-1: 1fd607a0fcafea0e134621e657d3ca02f364b817 SHA-256: 93410a5f80b9d9bb40a61ab0c971d5ff5dda547e48c2403958aab4e254ad513c
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a ClamAV detection and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The presence of numerous embedded URLs, many hosted on disposable domains or compromised CMS uploads, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a501ee974ab4475c6903a77198d9c96f/doxigamenozatuzabisoxo.pdf In PDF document text
    • http://chaukitchen.com/uploads/files/83330886505.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/romekuf.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/27100148249.pdfIn PDF document text
    • https://onlinendttraining.com/files/tokowebigasesusok.pdfIn PDF document text
    • https://ahha.az/userfiles/file/96836429006.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142f18758334---juziwofum.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/runejolotojikib.pdfIn PDF document text
    • http://clingac.com/d/files/pipubirokazoxot.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/puxarizodaresav.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/92654487776.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/1740026290.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/78658468822.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/p3ds7bohv801seckm1k31esug3/silinuwupenenikagilori.pdfIn PDF document text
    • https://termoformat.md/img/files/filevofosujuzaxugaf.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/nopoxewijewunajin.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/96542036774.pdfIn PDF document text
    • https://wecareprogram.org/images/file/rezexibesanomifik.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/fa368d71705639b9ff077234d731756b/pimopik.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/34755678526.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/jefagubafatekugujidoz.pdfIn PDF document text
    • http://compsult.net/userfiles/file/tinizozuxeka.pdfIn PDF document text
    • http://veitali.com/upload/files/62918095244.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/dolod.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/17975246130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=one+on+one+icebreakersPDF link annotation
    • 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_off0000b11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11F 14536 bytes
SHA-256: 1d930155951c1382a5e82efd66b18e99efa2448ae4c95ceeb8fb6046feb5a582
font_01_sfnt_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 10336 bytes
SHA-256: e3581466a27a8aad11dd0f9c752df86a83b15fe81c5865f336299fbe30dc2640
font_02_sfnt_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1