Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1a6933e17b6890…

MALICIOUS

PDF

90.2 KB Created: 2021-07-04 08:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03cf433670eba74a0eed505a3ed34263 SHA-1: efdc0ab43b90daa884489668bdb6ed28f273203e SHA-256: 8f1a6933e17b6890e691e006e6d39284d186d26042333bfc165d62569888ad69
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://foundryindia.org/userfiles/file/30564186480.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3faad0ef3---99048158046.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c1dcef9d9---kinegisubaxonupugi.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/qo0esnienigm1hb25u1hmmvnun/86531986912.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/29pek0f22sre5tsuhjk4obep7q/fivavetuxinoxojusewo.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ab453db54---xeforelek.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/5fc6ceab371de21f2577a5cd41f86e58/katidi.pdf
    • http://jrmhandling.nl/upload/file/fobemub.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/28hf6ia01cn00d28it70clgnrv/65334834814.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5220a34f02323b151d5c1bb23c4d6462/54185424994.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/4a5af397e56eb86d682651b5270471cb/71894257019.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/37d253b39621852410adda2f29e1baac/newiwajagirudilenuwojux.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608baddf56768---wamasejidonake.pdf
    • http://acecaalcoy.com/userfiles/file/25020683030.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcf6d8b893---wijajedof.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/22d9d46101b8f58a7622c97cc97c3104/widamom.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b2e202d790c58fbccc3b60cc4a69cfed/33688042579.pdf
    • http://dansensvenner.dk/imagesfile///gurepanafazizozem.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/de5f8c9f1cd7237b65646547bc87e79a/napololenodi.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2cf76243741b0537f652d9fd1742b653/51885819205.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160985c7d48457---dejurojutafitopuzis.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf8c4e932b---kurodasanefosebapar.pdf
    • http://sarljarry.fr/userfiles/file/98579714887.pdf
    • http://viprealestatebrokers.com/userfiles/files/zomobeguzifapusudamo.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc046b2a54---xozun.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=red+moles+appearing
    • http://irodori.kir.jp/files/file/8549281840.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100be.bin
4ba4eaf3b3fbe63124c7920097dc2465723b18b1a10556ed78e6284b63c95c6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x100BE 16496 bytes
font_01_sfnt_off00012b7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7F 16792 bytes
font_02_sfnt_off00014396.bin
f1c7c5d86c07f1408ff56a0448cba22cb5a26ee242c2ad802d28721ba3f2405b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14396 10680 bytes