Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2026efe8f86007…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 10:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 845a6aeb02f5db915dcc7d450b919048 SHA-1: 78c9d7c96c8aedce7c8e7e2000e2f9e1cf6fcf14 SHA-256: 5c2026efe8f860070bf4f7596de0c768a03aef13f983e6d0d6166caf9ff3420e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://inwebjor.ru/uplcv?utm_term=cj+cheat+ps2 PDF link annotation
    • http://darstin.com/userfiles/files/fadazugivupabere.pdfIn PDF document text
    • http://webbuilders.com/files/file/kidoxifijinufilironupin.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/2990848532.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/32277260169.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/26796977018.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/49453417723.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/16779017716.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/mijeram.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ced794c8a699eb403ddc179de4ac8382/podig.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/71973129947.pdfIn PDF document text
    • http://reichspfarrer.sk/file/fimowaxawakexefula.pdfIn PDF document text
    • http://acelybio.com/upload/files/mazadakupowoditawekipekon.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/gfm9tg5mh4gun0ps8dr0dlr4k0/buwotur.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/ligefixixopufos.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ceff23698f---lilow.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/lobuzexamanexaveb.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/liwofobutininax.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/regawevirawop.pdfIn PDF document text
    • http://parentini.it/userfiles/files/toraposowopulizegim.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/firixapekejavajigojev.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/6388953486.pdfIn PDF document text
    • http://sro52.ru/uploads/files/zelafezubilon.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/11577677296.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/85629886215.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210913074443_y7fyz4.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/zajemezedagisidukajob.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/883671385e78f9173e7881ab6c23985d/xusumoburinivojuxogaj.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_off0000b22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22F 14556 bytes
SHA-256: c1e0729d28e654b83c333b6ff749a4aef797fe685ffb163b4224fe368953b327
font_01_sfnt_off0000d6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 10292 bytes
SHA-256: 4a23e0acb79ed52c93d5c7b163f6774c08f87939a376079196b762c1b4d3e1ce