Malicious PDF — malware analysis report

Static analysis result for SHA-256 379bb97a18821d44…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 16:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45b553bdb1932f3b0e45f1433d43d87c SHA-1: b3a828f54a1f8e319dabfc417d16765e5a359382 SHA-256: 379bb97a18821d44049077f8c310b9af4da8c74d65ae2dc20211b29d60af2462
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated, preventing analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://gedayapi.com/userfiles/file/pojobejefodonegaxag.pdf
    • http://usa-ex.com/images/blog/file/31270143893.pdf
    • http://ranjitabiswas.com/userfiles/files/57446948382.pdf
    • https://avukatwebsitesi.kocgrafik.net/upload/files/42050173081.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612edf1f8d8ec---82079714101.pdf
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/47491763909.pdf
    • http://tabouligrill.com/ckfinder/userfiles/files/50195082629.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/v45ol7mmhm3hmfio5ci7qhn32v/mibiwemugujirorimive.pdf
    • http://npi-management.com/ressource/site-image/files/forefo.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422c9307498---78868282552.pdf
    • http://ud2-140.com/files/13275261257.pdf
    • http://caramelitos.sk/files/59233308568.pdf
    • http://kompassztuki.pl/Image/files/kimunixizer.pdf
    • http://mylodge-naoshima.com/images/blog/file/49405009231.pdf
    • https://franchiseharbor.com/files/files/tozanafivaxorejabegifat.pdf
    • http://viajaconsciente.com/imagenes/userfiles/file/lozova.pdf
    • http://valsadindustries.com/userfiles/file/11720831435.pdf
    • https://hbfilm.ca/resimler/files/68583860330.pdf
    • http://jvcc.cn/ckfinder/userfiles/files/210909182507808846jw325.pdf
    • http://karinameal.ru/imgdish/files/93295554436.pdf
    • http://thainightjob.com/ckfinder/userfiles/files/58842582028.pdf
    • http://hyundaidongdo3s.com/images/files/42425295807.pdf
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kixasajumevo.pdf
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/vudazigaminimepijaso.pdf
    • https://www.informacion-indoorclub.com/boletines/img/file/vitexaredevazul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=unity+android+native
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b15e.bin
9869aea7356387a5a1003034523cea1d63eda56e267793dea8d9a9e7950feb78
pdf-font-stream PDF embedded font (sfnt) at offset 0xB15E 18364 bytes
font_01_sfnt_off0000df9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9F 16792 bytes
font_02_sfnt_off0000f7b6.bin
10223d040f6912b30e28b3812d86ab9fd1c3d56b9d83b9ea067e75d3f5e6b1f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B6 10212 bytes