Malicious PDF — malware analysis report

Static analysis result for SHA-256 94168a449d97bbc2…

MALICIOUS

PDF

96.1 KB Created: 2021-09-21 22:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d725e0f8164c3b8b6ec619b80c159e19 SHA-1: a79d2fdb9603cebe9da03fca660c320f433a077e SHA-256: 94168a449d97bbc2fe47115954e0366e1448ca9ac20e82f845c32bff2ae7a08a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites. The presence of multiple external URIs and links to compromised CMS uploads suggests an intent to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=desire+guitar+tab
    • https://www.agencesramos.com/ckfinder/userfiles/files/lujubesawineganu.pdf
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/17323422054.pdf
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/93056620984.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/daa36ca751f2767d93400a1621cc1dfd/vovaxomeraxivowojimes.pdf
    • http://fotografoenricogiampieri.it/userfiles/files/19151578745.pdf
    • http://k1a.ru/images/files/file/jelosesadezewusabo.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161454f4d27f73---saporalivigisud.pdf
    • http://cnhhgj.com/upfiles/userfiles/file/33068539234.pdf
    • http://perksys.com/userfiles/file/67385315129.pdf
    • http://zhxndl.com/uploadfiles/files/xesutepoxavujul.pdf
    • https://soswzgierz.pl/web/uploads/files/67203041428.pdf
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/18908241854.pdf
    • http://elementsgogreen.com/userfiles/file/fobuvabi.pdf
    • http://wellfoto.cz/pictures/files/lurukipopuna.pdf
    • http://atdawnwelift.com/userfiles/file/badin.pdf
    • http://ceomit.com/fckupload/file/tujuramadajevejurivezilur.pdf
    • http://diplomat2014.ru/ckfinder/userfiles/files/xidexiki.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdc38b10d0---50377570984.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1c2957739---luvusus.pdf
    • http://hotechike.com/files/files/bamepidusuganetanez.pdf
    • http://ageddfjtj.pretty-match.com/upload/files/nofomap.pdf
    • http://mobydick-band.de/fckdata/file/50110724364.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ee0.bin
a5999fb733925e9bf4a23bc11ccfbd2a1215c05943a163d49a2d01907db6469c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE0 20244 bytes
font_01_sfnt_off00014380.bin
976858cc3bb558858a19b1a44c4b5d8fc37c91f8b48378ee09f31dbf5bbbeb70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14380 10256 bytes
font_02_sfnt_off00015ac8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC8 16792 bytes

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