Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f6a66fb6aa0041…

MALICIOUS

PDF

94.7 KB Created: 2021-07-31 10:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ea98bdcfa1cce14b7afe5b41efc37b6b SHA-1: 8a858705aa5d8a96af24691c9d08f1595435b830 SHA-256: 87f6a66fb6aa00417f68b8e134dd7ece2689c54e7616f19b89d74d4299f86b4b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised or disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The PDF structure and numerous external links are consistent with a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/mokexutobux.pdf In PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/75321078201.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3d3201ec7---mabufunuzabil.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f435dda86---31206999330.pdfIn PDF document text
    • https://12tiga.com/contents//files/31822956796.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cec20d5789---31951646449.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/88139780836.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dc8c9c2ab---vezamuvagedigisodi.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/tiwutoxuwi.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/i957h4c326mkm4fdh241h4o8f3/luzimopavebi.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a436ef2d97a---12747020961.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/cfc66919243561435687aba413050cc5/niwadepixoxumatakunugixi.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/gdpvnkikhmiqrk6gqf75hd9qhq/katemozami.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cc504be66c3---6234503636.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202175344147475.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cd92ae865---39205266415.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/30de8ec225811ff5996cda1d915ca924/56387222930.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c069a8fcea93e3b4f72f4ed04acc4f14/juses.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/812cbe3eafbe76f6e926a7678cab5703/29746953677.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/61b261510ad33cffa4037b378525ebbf/92517687023.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dcf9c04750653f7f5cf391a7ea83b6b4/lofuzimivajegumax.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/zikitepo.pdfIn PDF document text
    • http://stylekd.ru/files/bojobujiselu.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/29629178226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=henna+tattoo+designs+shoulder+and+armPDF 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_off00011197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AE 10784 bytes
SHA-256: eb4967a6fa69d938c165f99d01c10602e0b1094d2048e28f28cd6a4bc8da5c9c
font_02_sfnt_off0001420f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420F 16148 bytes
SHA-256: ca0d4196d8206ac48fb886e9ac91ee9fa2b3a3e3be5c3921563b2d48d5401aaa

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