Malicious PDF — malware analysis report

Static analysis result for SHA-256 510f0e6412a9aa9f…

MALICIOUS

PDF

89.1 KB Created: 2021-07-26 11:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb774bd612322d5cb66142615752acf4 SHA-1: d8e1860e10acdf0b164a49561f51b514c6c30ed1 SHA-256: 510f0e6412a9aa9f00018f552acc7a02a48a9862bfd46d5c917dc562e5054e8c
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised WordPress sites, suggesting a tactic to distribute malicious links through seemingly legitimate but compromised infrastructure. The document body was unreadable, but the overall structure and URL analysis strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ackerviewguesthouse.com/userfiles/file/zitumesegasatujaripa.pdf In PDF document text
    • https://verticala.ro/images/userfiles/karika.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/dosomo.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfb327974b---tarirunaw.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da4466d086c---78341223675.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b885dcd6a0---26663988882.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607860d1c1d90---31106648857.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a22bd4855bef8258912d5e76b3953de3/nakup.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/f9uhdj7p17nu41kf4a4jkvfcr5/86104033495.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9304bb3cfb1d88f63f196357ee4b1ec0/kusuket.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cac80da219a---gezifiturekojumef.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/guralagaradamidukevoro.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/ponanugufomopamawabom.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/losiva.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/285c4435a15d86339295ff2c55c7cb1c/93680385647.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/3ce8d3826313f3429b5c469f2d9427a6/39569551415.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/nisovojoka.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/tasobojedasu.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5574a1de7---95050773206.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcb6f0c5ad---78101484111.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/51503295579.pdfIn PDF document text
    • http://kimthienbao.com/userfiles/file/99931896830.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f513b1f49---vowutewedizevopijopoliv.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/vodafijulafisoxakije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ejercicios+de+razonamiento+l%C3%B3gico+resueltos+pdfPDF 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_off0000f2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C0 11376 bytes
SHA-256: bb26ac7c77062322d58dbbdf28c6de8c87d0fe050951b21f60619057105a9d15
font_01_sfnt_off00010d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12525 18880 bytes
SHA-256: 103c0809d0fc31ab077697ce0eac36fd9cc53b6c15e0d38a50517cc90fa0c39b