Malicious PDF — malware analysis report

Static analysis result for SHA-256 074d3e617f8dee99…

MALICIOUS

PDF

69.1 KB Created: 2021-08-29 23:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f3563fdbad770be22bc3006ad43b33b SHA-1: fc8c0b70f4f25a13b12f075f0d6e0bbf7aa988da SHA-256: 074d3e617f8dee99ef64cb3913af17600837a73041cac758bdc06dd67d2aab0b
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 redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

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://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/4a030c89951f31bc47fc2474120584ae/66612373118.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/f3c239e5a0512959b1601b9d1c0f8425/golezinalazir.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/6eb6b78d9b938ac017c75b7233ae8c51/kesulaxoraxoli.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/20mnjtck4kh7dr8hbmqu0usrj3/julogabewubu.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/82c0fc10d439a3255a38d2209d55a2c2/melofusesoruwatuwefimo.pdf
    • http://tcurryproperties.com/konadnew/userfiles/file/sixiwojoruduj.pdf
    • http://newo.ru/files/files/22229073035.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160805a3908617---45462406998.pdf
    • http://entryexpress.online/chapter_images/files/nuzap.pdf
    • http://sp3siemianowice.pl/userFiles/files/43475478489.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b982aa5bd---83614645975.pdf
    • http://www.tamtrebinhminh.com/public/files/nisogizelewipalawag.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/c60tfnoebtctu64ju3e6lau93o/86985937944.pdf
    • http://raylutickenterprises.com/userfiles/files/suvat.pdf
    • https://balbok.net/admin/ckfinder/userfiles/files/14475032778.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9699242a7---54157462015.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/n2ed5pjs4318lqa79v049btqe7/38472582310.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/0266b0f779a5ca7d78a5819c292ee287/46881006050.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087c22c2a8e3---webebonuniguz.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e22bc05a661---dadofefodipebexosasofux.pdf
    • https://heritagecambodiatravel.com/userfiles/file/nojifivekafu.pdf
    • http://photou.cc//ckfinder/userfiles/files/72416055966.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=meaning+of+recessive+allele
    • 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_off0000b352.bin
f11d5fb24a3d08d6040fa3c5ceb77c4c8b878f74d8c42ce3f7c473cf1f1e8df5
pdf-font-stream PDF embedded font (sfnt) at offset 0xB352 14440 bytes
font_01_sfnt_off0000d75a.bin
6fde81d9332e2bcc3ac26c23bbfce900b07484d8027fff73ccec920ea9d1ac89
pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 10472 bytes
font_02_sfnt_off0000ef44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 16792 bytes