Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f376753cc365f28…

MALICIOUS

PDF

91.2 KB Created: 2021-07-21 17:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 00ac3ddc64b0b465cb568790adf5fad1 SHA-1: a61a3afd1a8c4d52455d67e9f579f6d62bd077e1 SHA-256: 7f376753cc365f282a680b8a8bfcbb7ced7cc91da7b697472b50351b7ce219b7
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate the PDF acts as a link farm, hosting numerous links on compromised WordPress upload directories. These links likely lead to phishing pages or further malware, making the PDF a component of a larger malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://noithatphathuy.com/Images_upload/files/30633240791.pdf In PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4bc5cac843f9f44d87784005c3714bbc/6162580810.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ebaca3023---42674385631.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/9f27cf2805c212836fd3fb672e04eb27/puromikodi.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/flah4fiqv5n27nen4iobi8f1i0/50960981335.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdfe5ec2a0---30627388051.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d074e32a7f---wutupetagenagus.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16096756dc1725---15316240483.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/i0enlv281ji87r026uvh5aov50/78658902041.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/v83181ka6k6keage50pq806699/50737842399.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/repanoves.pdfIn PDF document text
    • https://nattasampun.com/upload/files/84565096055.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a4d2f5173d850f2d9df3387a8e9df6b0/lolonisivumadalexabogarar.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/ig746v7ljebilces5ee77dgqva/fawamopixowirigabe.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e17d6ac7f8d---binudamizetofowizu.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/96547127287.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/66862069591.pdfIn PDF document text
    • http://godswaynehemiahmbc.com/clients/878002/File/12193912381.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091635f1421c---bibugo.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/ranibim.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a62755a29d---77700028130.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/vetadugabe.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9112175a28---fajukibol.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/rexekejema.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/70793083734.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ed833e8c---voxazimenujebizejonuzax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=grand+canyon+sphinxPDF 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_off0001015b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 17080 bytes
SHA-256: 8fbcd86ec17995a835d32e05a378d21adb35ba94766a5221ad1b15fcb5c8c238
font_01_sfnt_off00012da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA6 10588 bytes
SHA-256: 565c20e2bb20e7d0c9bb25ad7afa9c4b6b846cc1bdc5270d85f08b52f7b7cee4
font_02_sfnt_off000145c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1