Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0c2e504fdbcee6…

MALICIOUS

PDF

70.4 KB Created: 2021-09-13 22:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7d6a2786562f6c5169adaf194e88afc SHA-1: 50b58637a9bd56a2022b6fc4aa0d9c7f8f7f6c0c SHA-256: af0c2e504fdbcee6920f8fd735d4a6ad601f8f90ce0f165c8c9d7828e34e6f08
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to various domains, some of which appear to be compromised CMS uploads, suggesting an attempt to lure users to malicious content or phishing sites. The primary attack vector is likely spearphishing attachment, leading to exploitation for client execution.

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 https://pistant.ru/uplcv?utm_term=windows+7+enterprise+iso PDF link annotation
    • http://raylutickenterprises.com/userfiles/files/53491231089.pdfIn PDF document text
    • http://panteres.com/files/files/56016806698.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/43043181790.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/61051409621.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da76fd1ce6---42388382206.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/dapifijizovojirikeb.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/86997937b0ef08558c8dc8639632f566/78576246903.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cde4be4a26---jedudetanokivaxizuzadide.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/64524728158.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/jametuneju.pdfIn PDF document text
    • http://prmakeup.com/Image/files/zodolev.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/31108330319.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///84707980000.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/87505840720.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/davume.pdfIn PDF document text
    • http://gabortech.com/admin/file/79122051269.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/zekoba.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/21814908330.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/92870957780.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/jubidofe.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/wexotimavukezowajixolew.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/mimakokegotelituf.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/16464703339.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_off0000b2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A1 16500 bytes
SHA-256: ad765b4191805f4d72e81b868e33bda4809c55bdef4312fdf9445284ad46dcae
font_01_sfnt_off0000dcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 10308 bytes
SHA-256: dbcdcd923fac30a6b6cb5ac6855aa0027153dd607eb25050f7c9633e51a88d09