Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b7058c5b87d14d…

MALICIOUS

PDF

76.4 KB Created: 2021-06-19 15:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bcfc52f0193025d2517ae5f87bbd766 SHA-1: 411fdb5297476ab72cfa48dc1d04dfe3bd212489 SHA-256: 25b7058c5b87d14d921d0f1187c082cfb43ed0fc862d6102fc20bd4714f29d62
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised websites or disposable domains, designed to trick users into downloading software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it acts as a lure to a malicious download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://beachfirebrands.com/userfiles/file/zadonipolenin.pdf
    • http://apexibd.com/uploads/fck_uploads/file/zukudajuv.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/84e4a63cae5327b6e9f4cc484207a3e6/bunowavetijobak.pdf
    • http://datev.hu/ckfinder/userfiles/files/69041733209.pdf
    • https://clinicscrm.com/img/files/zabuvemu.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4df7e2ff8---52787642803.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a60b0d73b---56936367703.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/d7624d992949a852dfc6091c3cab4f8c/87643704376.pdf
    • http://bmcnx.com/userfiles/file/70016535427.pdf
    • http://ottotech.center/userfiles/file/dodan.pdf
    • https://iamtimeshare.com/userfiles/file/rabatedimufopadulofuz.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/4stnvlm4lekaqbkvr8461o7fsv/13401609410.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc81323cdc4---puwofasinu.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/47625550454.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=filmora+free+download
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2a1.bin
b592ede735f354d5596da8b5c0c0cf3a781354cb20f7488784d62a4d7e62bd49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 4632 bytes
font_01_sfnt_off0000f23d.bin
73c99c385d955e18ea65205402737cd5b11c68786970396b6004498b9a8ab4e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 10824 bytes
font_02_sfnt_off000116fe.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116FE 4324 bytes

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