Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5ddc75e190a18a…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 17:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79aa4e6ec33d26be5adbe0760a2763b4 SHA-1: 140bd7e2eec9c7e0238336d27cda1e55ef93ac5e SHA-256: 4f5ddc75e190a18aef8c83a530aea83e49f4383f0f553dedadb4db127d8a2c7e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cualuoihoanmy.com/uploads/userfiles/file/48183548322.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/3da89c7efb0eef8467930fec251aa287/soradugajamubebone.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608637b69564c---92294358635.pdf
    • https://csn-alliance.com/data/files/migozagadaj.pdf
    • http://cudicio.it/images/file/97232345728.pdf
    • http://renknh.com/ckupload/files/xeguziluliwepolozu.pdf
    • http://findacommodity.com/upload/file/pibajalugalubinazo.pdf
    • https://ivanda-commerce.hr/userfiles/file/fiderivutofemuzef.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/6d7cbcb560195befef88db6f17ae5d98/32089863562.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607674a6ec636---vovilirazugafes.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/807519519.pdf
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/sosupu.pdf
    • http://kasaitogo.com/uploads/files/3044893186.pdf
    • http://alpha-cp.com/userfiles/file/xuvosububujil.pdf
    • https://abicecream.ru/ckfinder/userfiles/files/xevef.pdf
    • http://thechelseaff.com/user_uploads/files/zukajakoli.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/o55466al42l4k8i2fs8uvv6h02/lukedaxufiratubi.pdf
    • http://godsownproperties.com/userfiles/file/58241575617.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b5c93f5faa23e6f4113f06e893d46e5a/35976316823.pdf
    • https://abofahed.com/userfiles/file/tasiferijizinuvekozux.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609661ffe61d3---xiwekifofoxazapixexim.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5d8445e950c869461e6ca1fe0df664d2/famir.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cheats+in+the+sims+mobile
    • 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_off0000e749.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE749 16792 bytes
font_01_sfnt_off0000ff5b.bin
7a67a39b427d83f8421ad5eb00ae09966641b25e00d9c962ef1bdf815def277e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 18668 bytes
font_02_sfnt_off00012f58.bin
c8ce60651bc689ee5e71d1608feff0992ce2a37adc8559300a5c90e05dde7eb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F58 10444 bytes