Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c041bb94c592f87…

MALICIOUS

PDF

76.5 KB Created: 2021-09-27 00:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae2f70327a42e54720f481fb63d87494 SHA-1: 0b5dc68fa91a8eea1afea957496401e1a6763ee0 SHA-256: 5c041bb94c592f87158e878a2e10953e96d7d163a91d59ffff58a6fce234610e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the document functions as a link farm, directing users to various external websites, many of which are hosted on disposable domains or compromised CMS uploads. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=the+us+office+putlocker PDF link annotation
    • https://kasihpaham.com/contents/files/8020846282.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/23656785681.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/35592170255.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/32064287613.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/465976689.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/72699047682.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/riratinelivagubinu.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/supilatenuzexamejovefimep.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/mevedibujude.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/89171524543.pdfIn PDF document text
    • https://lemondedelaura.com/userfiles/file/vorodovamejofawopibov.pdfIn PDF document text
    • http://elitvorota.ru/f/file/34851004519.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/vomejosenekapoxuvokizago.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/latepewovefowegoluv.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33133633050.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/62360256725.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/46804535943.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/89429745081.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614db715f0d15---3951021092.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33267198116.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/54342007f7c4916eb1ff1218de232931/97493413270.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/71986677947.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1ce11108e---5022484932.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_off0000be08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE08 10468 bytes
SHA-256: 214ccae4b6deab061ae46ff8d03938a5c4548df7fe8c6419fd9000c8ab8ff38a
font_01_sfnt_off0000d5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 20100 bytes
SHA-256: 4a9fe29746f998ea650e92a84d1365d04446d1b190e56b480cf8ce13b814039c
font_02_sfnt_off00010a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1