Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fa290f6bc5b375…

MALICIOUS

PDF

93.3 KB Created: 2021-06-27 20:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39d5621abc5bf70327eecb0c59be3fd4 SHA-1: 4211073ec9e6b0e790049273c7d0b953ce673f77 SHA-256: 23fa290f6bc5b3752e798962bea6f8637915f1e9129f409295b4c8cc1da2250e
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and a link farm indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=hecate+goddess+of+witchcraft
    • http://greenlivinggarden.com/htdocs/UserFiles/file/zaterupuj.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/d031f745b4ae3e90743fa74cc24feaf1/56061476606.pdf
    • http://mosjob.ru/images/file/5985184662.pdf
    • https://evpersoneli.net/ev-personeli/file/zumavonisuvumegovetow.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/5193266099afb173f878f96fff0924bf/vebowatikofowezu.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/856aa38138e04d8ff99a441e655811dd/36996075894.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4ba8476a5---denetewol.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16084db90a9f1f---82757200011.pdf
    • https://cortopolis.ar/userfiles/file/majogetowibetojesokutu.pdf
    • https://loctra.net/userfiles/file/monukaxibojutekokodofe.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/7149d3a9c841525e426b879a469d8928/pewila.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93df50dd2---wararetiniwiroropotusu.pdf
    • http://tahi.hu/ckfinder/userfiles/files/tawabegofukujirekumozo.pdf
    • http://157.230.241.115/image/upload/File/liwodino.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/1a4731029eccb28ac24c70460b82c11e/58536028336.pdf
    • http://php-lounge.de/userfiles/file/40561124295.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/bb239a829e4c3f127c8098ee5dff06f6/komup.pdf
    • https://rajaunited.com/contents//files/34564635880.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf42ebe61b---gomirexonijapi.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fd38e1bcf---28225164816.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b89721c7997---34185628510.pdf
    • http://alohatoypoodles.com/clients/1/11/1122824db0f83c9e74cf39311881f217/File/penerivebafezunidakapotuj.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_off00010bd5.bin
cbf9ca9466b9e23b8768d423185ebe9d5cc2ebe34aec73d4fd9478369df6d788
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD5 17004 bytes
font_01_sfnt_off000137d5.bin
d7dc4f5651e3842e31e02f5e15f3ebbdd79a1084b550985119ad397caef0b2d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x137D5 10684 bytes
font_02_sfnt_off00015050.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15050 16792 bytes