Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86f2a63763c9f12…

MALICIOUS

PDF

75.9 KB Created: 2021-09-03 02:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a0e80369653cd9907905effeeaf3be31 SHA-1: 467d06a8fde9765913509fa3b5ed97ee1a52b0e2 SHA-256: c86f2a63763c9f1210bafb2d163f29357d4ad68ed6a6df66a99a8af197a7c2fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign, likely using spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://oniceh.ru/uplcv?utm_term=valkyrie+profile+lenneth+walkthrough+pdf PDF link annotation
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4c0e62412---91293013314.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc45d2e859---30015227770.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/27835654660.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/tamitawexorivavunup.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/2134918667.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/wabozukoxosokobokuge.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a243c1bf0a9---55235858827.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/gijibozemanuvopisewebu.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/pogewepik.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf9f50efa4---bonosigenu.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/88481625972.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/rozutuxis.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/lenowagevimilonigejis.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/s8v99t9dlot3m1a0mt3tcav6km/74808876353.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ac79ab4e548---53793417144.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/zunizixutoselus.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/qchhmtkorcgn6vthdh3n32fkr3/desejejunomaxevixekage.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa17898b5b---tikupofogovilasojid.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nimoxiwumidozaxejeveka.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/1255740962.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/kn92r7ebvd4optgvlp50m1lgsq/posukuzofagukoze.pdfIn PDF document text
    • https://guijek.com/userfiles/file/79004278048.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079a011c2450---19664184439.pdfIn PDF document text
    • https://motacademy.it/file/6595382293.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/tovitesipugedumufa.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924b2ee52f6---jabodudawazubila.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_off0000c5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC4 16432 bytes
SHA-256: 16d490fb953c62da4f593dc8f0a3523289153b20856c7318d6f1380a76352dd6
font_02_sfnt_off00010814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10814 10972 bytes
SHA-256: 12dd82e7e3576be05f5297708ecfa72996c55da30b603e606963cbedb4f99b9f