Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec411b27b6544a6…

MALICIOUS

PDF

97.5 KB Created: 2021-07-23 21:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fa95c7a8aa8f744f90ff1f880597280 SHA-1: 6b25e9d5287a283573bc3ad65498a54ff96e46d5 SHA-256: 5ec411b27b6544a657476cf0343f020d6094024fa65cdbaaea95ed1359cffad2
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, with several links pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://baggiez.net/userfiles/file/81471223314.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e5a03de4e---85782687783.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160e14f23a1e1e---31205777922.pdf
    • http://generaltubi.com/container/ckfiles/files/lisizudibemazi.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/3f22ae01a930f9745bbe655cadd5b780/81444434785.pdf
    • http://kaies.cn/upfiles/210704082354316642kgi4c9.pdf
    • https://davaocarrental.com/images/file/91488927106.pdf
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/54f9321a08877bfaee25033ee1334403/47454276980.pdf
    • http://adance0112.com/upfile/editor/file/simur.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/04566077d2c540d21fb0ec088a9a6881/vipajumasaviwuzobu.pdf
    • https://ludifrance.fr/userfiles/file/jusagubitaxuruj.pdf
    • https://dhcom.vn/userfiles/file/dulukogosu.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/21960722067.pdf
    • http://gleneaglehoa.org/images/file/supugemixu.pdf
    • http://mishelik.ru/userfiles/file/farafawasu.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b35293d32---10559255997.pdf
    • http://ikhmongol.mn/ckfinder/userfiles/files/41395094462.pdf
    • http://munnarinfo.in/userfiles/file/90999224786.pdf
    • http://ajtoablakcentrum.com/_user/file/sabebet.pdf
    • https://dm288.com/slicice/file/87072438798.pdf
    • http://lauraestetica.com/userfiles/files/zodiwup.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608451b017ce8---nafotonapilubof.pdf
    • http://www.moyekolodin.com/files/rutavu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=complete+anatomy+platform+2020+mod+apk
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa13.bin
0e37ed97f61212ea3cad2470b747f3ee553a199f0efe77ebc1756734a30bb477
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 18240 bytes
font_01_sfnt_off00011640.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11640 16792 bytes
font_02_sfnt_off00012e57.bin
60965e654b4d59ff145b91f5fa04bfbbf6389e52e9d668bad0db6d27891c6ed5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E57 10880 bytes
font_03_sfnt_off00014790.bin
bb53dbc0a16277a88c01f6c2555a0b8392a59a54675faeb1500beb470fe2f3a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x14790 18236 bytes