Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b64605cda4c4f0…

MALICIOUS

PDF

79.1 KB Created: 2021-05-17 14:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5dcaf70a14b0ff83e2d14c5631d85209 SHA-1: 34318f40ce3a8b679c93db5170bf44ab15a59d53 SHA-256: e4b64605cda4c4f0f334c52118db7e3c199998f41faa7d1cb74b221c78beadf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9452

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://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071a0a88bd53---42170836139.pdf
    • https://al-farh-iq.com/upload/userfiles/file/dukusivuzejowuzuje.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/6gnvvuo5b7c9f6032vm60r7n8p/nofulerawi.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075199b2fbea---xazagofosed.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/56e3ce824f995b9fa11b706324e7d526/runigunonamaramokoj.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac42135df2---gurujulena.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886d06ebe49---97317413539.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607401ce791e7---xedutujeva.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b668d79732---ditomoju.pdf
    • http://gptools.net/userfiles/file/55247082084.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/81f7750e408012220a2f3d7563a2fb5f/kawotafarob.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/aad7233b433666df4f87052d01642a93/53585119686.pdf
    • http://nedirajtebosnu.net/userfiles/file/79233756183.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/11c10e79aabdab0ce65940e0ebcada17/14568619657.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/ab3cd9e3ba254052ad3078bd4b31fc8d/rebadajisafa.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/k7uhi5hanfg0b39lmv9a6tq9u7/wanamemizevizajanonazor.pdf
    • https://moto-trend.cz/public/files/fck/file/76866117657.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9db779ba304651baf8eea7e4e0eec83c/detusuxelenurapezuwemevob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=1994+prowler+travel+trailer+owners+manual
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f3.bin
590e9be0b50ea5e5cbe1634b40faffd66d272f9c08455f027721636db231f12d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 5200 bytes
font_01_sfnt_off000102a1.bin
e267a05449b27ef7498c683164c544aaf05a3cf6c4857e1d11308bdf019878d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 11904 bytes
font_02_sfnt_off000128c3.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x128C3 4324 bytes