Malicious PDF — malware analysis report

Static analysis result for SHA-256 a852194013782e76…

MALICIOUS

PDF

54.6 KB Created: 2021-09-13 05:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02c3491a03fd22d76ecc11b65ccfb9d0 SHA-1: 7834e9ef564de96c2ab7034da63bf948cce7be1c SHA-256: a852194013782e76f64c274ff8fc013f72d5d076230a47b258ce2ebe500101ee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are typical of malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6865

Heuristics 5

  • 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
  • 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://krisoc.ru/uplcv?utm_term=beginning+x64+assembly+programming+pdf PDF link annotation
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/458a03d2a88783f56eb802edf3b5dd80/gejedudomiwarulunosoj.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/aor9uardff6bt9en4it38be3g7/76595625177.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/88217555536.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210903_E142FA449AB6730A.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/dategubug.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/62386038165.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/zazilesewovovipidoxas.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/70550792119.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137debe25ce7---wurizuz.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/bolifabaluvutugadisimup.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b131a91035---6425761716.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/89739932685.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/80184887298.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/fizivitovi.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/19209050252.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/xasedome.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/xisotizejufa.pdfIn PDF document text
    • http://findusafranchise.com/files/files/mebagedowenovoloze.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/kepamezexa.pdfIn PDF document text
    • https://baptistfriends.org/media/rowodik.pdfIn PDF document text
    • http://infosierra.es/images/editor/levipodonewozopotip.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/33270745169.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/40504462014.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/28988719433.pdfIn PDF document text
    • https://pmms-online.com/assets/file/48936286634.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/32639843571.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f08abb6a9f---vumematamifulisarobis.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/fovisa.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A0 11396 bytes
SHA-256: 3b90f73ab530439bc76b58a46ca2bb5092a6bb40682e6f722469006cf7209bdb

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