Malicious PDF — malware analysis report

Static analysis result for SHA-256 22914fc81a8d5651…

MALICIOUS

PDF

88.8 KB Created: 2021-08-09 07:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 293a96991379dc124013073814d3786f SHA-1: a5b5f6b3e3590cecacf34b2baaf5cd03829d350c SHA-256: 22914fc81a8d5651d2b7284d077949e823cb685c61962e80527f7c6d2d159969
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting, indicating an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure of the PDF and its embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://micronforgacsolo.hu/UserFiles/file/zogevozakaketiruxa.pdf In PDF document text
    • http://brucemaymemorialgolftournament.com/clients/d/d2/d245e0393a5bbb16d67b82808c007790/File/bifef.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070475d266bc---47537334904.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/nuzokoragafitakunanim.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/24724221559.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/tufufef.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c3c10486e---likuzivexekuxibofofi.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/g8vhd0g8f4vl01enamuj3u69sh/85981837038.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b309e31eab5---bajiluxiwagonuzuka.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/vakoxebosi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b8bc6893c---janixijexabekobajesuv.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/kotixed.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/berarodijakezoduxifiti.pdfIn PDF document text
    • http://web68s.com/upload/files/sewefubojasuroxov.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/22811541298.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/d48cfe829e7059344bf975a4d4391553/13547481211.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/9g8c7f5itc4p6s0bjeafor2cj0/wemixekatufadolimaxulora.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/70399180101.pdfIn PDF document text
    • http://goref.ru/files/file/gafebadudovopas.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c4fecdd7e73a112e68f98387d03fa0b6/20511492239.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1a12a00fe42aae383464ef227f92562d/93928115188.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/3456362217.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bf5b6ed99a---82918821468.pdfIn PDF document text
    • http://iwishop.hu/file/jerikazezutos.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2p2oj7sbnsu9tbs5jpshec7f70/37158424956.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70a6df2665---leziseboropebaxofaresesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=stanley+fatmax+700+charger+instructionsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 17924 bytes
SHA-256: 36632e99b66f71fbc46a7a8f2ab70fcbe894c81918bef056b223064745bc64a3
font_01_sfnt_off00012323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12323 11348 bytes
SHA-256: 2d6fb1ecff7e56b3ab95c3561ae1fea182645298431357b83728ca2c2e95c072
font_02_sfnt_off00013dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1