Malicious PDF — malware analysis report

Static analysis result for SHA-256 6841d616dbbd0322…

MALICIOUS

PDF

70.2 KB Created: 2021-09-17 15:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 499cc97f46a069a1bff995b62037e390 SHA-1: a38a7cb71849c657ca1a457fd1839edd22ced568 SHA-256: 6841d616dbbd0322b60439c9df489b65252543e83d9679abe9470e10d2bedc33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://serramentisiciliano.it/userfiles/files/regajuzo.pdf In PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/29559569448.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/savujutisiwowusipa.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/titivojogiziratawatot.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/55192735635.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d9e52c85d---lonis.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/99424933076.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/31862580240.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/1084bptqoghcgsa2c9ahfc4926/6667682961.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6134090E77240.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161375bf9ad020---22404720832.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/bezesavaruwolejod.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d64584e9d49443736c243b51f813284/30186109314.pdfIn PDF document text
    • http://chinalabware.ru/d/files/68912502247.pdfIn PDF document text
    • http://turnyras.lt/Files/file/xexaxateso.pdfIn PDF document text
    • https://rafautama.com/uploads/file/40498756258.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/memuxo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfd3c5a6d6---vukebajesudixugomidozus.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/84754713070.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/gukoxuxow.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/biwafosavavisuxo.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/2003828205.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/97720393533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pokemon+sword+android+emulatorPDF link annotation
    • 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_off0000b214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB214 10688 bytes
SHA-256: 35439fafd081fbaa1f0b8df17beca70f70e9127ea1d9daee457f413d1b7fa49a
font_01_sfnt_off0000caa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 16176 bytes
SHA-256: f5d21c6e948c5e4cfec41d0f29dccf00e4c9514af07067684dff9e62ad12f807