Malicious PDF — malware analysis report

Static analysis result for SHA-256 6914c6b4606875c8…

MALICIOUS

PDF

104.4 KB Created: 2021-08-06 13:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d675b2b2407002a2a42931f8f3e00a71 SHA-1: 8edbbe79439c88e8191ffa187fdb997bb0fb0965 SHA-256: 6914c6b4606875c81c674376022412c5b00258971fb716f447cb0dfee32db4ee
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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 http://e-district.org/userfiles/file/93018146683.pdf
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/gefim.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b394b6f0a9---12322227410.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/eg61moa8tr2ld74molujs335nq/69654002773.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/7ac4c72cbb68120dc6f7a15043ebc764/68868856565.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd61faf491---27846201964.pdf
    • http://krasneclanky.cz/uploads/jebirovigumuku.pdf
    • http://banghetretruc.com/media/ftp/file/kifexuni.pdf
    • http://meta-min.com/files/nuxoxapizemenuxepep.pdf
    • https://turismopontevedra.com/ckfinder/userfiles/files/37533779854.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd39b38bdfe---92764858903.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af778f0d4b9---xosijemel.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd8339c35---7513567466.pdf
    • http://fouladsazanco.com/Upload/file/mutefovub.pdf
    • https://rybczewice.pl/userfiles/file/19262956038.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16081dd3f81ac6---89439305701.pdf
    • https://moolans.com/uploads/files/lejenefilid.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607910b434831---rumexunaj.pdf
    • https://susta.vn/userfiles/file/62978515768.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c393e38c6e8---rafigerosuditeba.pdf
    • https://cicadit.ro/UserFiles/file/17768323580.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085e7a49ee78---2462834051.pdf
    • https://goodline.by/userfiles/file/95894810813.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+the+roblox+id+code+for+death+bed
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d2c.bin
1ecfda7d95e8d33eb45dc6ee44cfc3a2cb3bc47dd5eb094911c00ed9098f0147
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2C 10704 bytes
font_01_sfnt_off000125e0.bin
3c0cad4ddb65496521190dca25cbfa6e26b9838303dd199250db85846fa934ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x125E0 19464 bytes
font_02_sfnt_off0001584f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1584F 16792 bytes
font_03_sfnt_off00017060.bin
cea506bee623e9d461daf67fde29b21046093097278feeeddeaab5524fb2d900
pdf-font-stream PDF embedded font (sfnt) at offset 0x17060 16272 bytes
font_04_sfnt_off0001864a.bin
d4364f076a5a0a8c4fb0890cdbef06e1c249613b5c4b50ceb85fa4cb2359bb99
pdf-font-stream PDF embedded font (sfnt) at offset 0x1864A 2516 bytes