Malicious PDF — malware analysis report

Static analysis result for SHA-256 f742e8199c0d0224…

MALICIOUS

PDF

68.6 KB Created: 2021-09-28 04:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef2583bb487421db854205fea7c2eb0e SHA-1: da8a82caa051a43ccf964bebf3fda6655f5db257 SHA-256: f742e8199c0d02241c4a213bb607f94b598418f900883f0c8e4a8016400553ac
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to link farms hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://synerhu.ru/uplcv?utm_term=idle+breakout+hacked PDF link annotation
    • http://holztreppe.pl/userfiles/file/74010849419.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/xusejerudow.pdfIn PDF document text
    • http://kmimmigrationlaw.com/userfiles/file/7152692356.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/79274328163.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/levibaxekalijeriposod.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/sodafikegiwos.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/lipariravomu.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/92321962046.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8f3467526---texorisedofoxanexozop.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/50672291580.pdfIn PDF document text
    • http://suamayphotocopy.net/userfiles/file/gesimozesoxewikeba.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/ponaziv.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/dc251bb74d8b232c31788fe6abf90762/gafozed.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/4c31a98eb8ce84e1f982702e29b04008/54041108440.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140b1ba57801---zujegagukeseloj.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/52446024549.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210928_F63A7557481A0FBB.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3b111e1ab---sidogaguvak.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/vigalo.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/nukoruragut.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/wilajisasuvifowagivowo.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/52985195412.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/xefatimutijezu.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109260303178801.pdfIn PDF document text
    • 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_off0000afb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB5 15072 bytes
SHA-256: cb15ca2ba23c072ff3cd71053f1f0b747c3fd765c7d8d161a7daed10e7bbf077
font_01_sfnt_off0000d57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 10384 bytes
SHA-256: 8c65ccf05e6df2b975401ee3141084acd403e57b484a46877bab68ef3960f72b