Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea161acb974bc9c…

MALICIOUS

PDF

85.0 KB Created: 2021-08-13 12:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 479aa43fdcdcf41f0c5650662abb8f2f SHA-1: f2300ff9c3a5ecc6903f2fdf69cf6b4612a66e70 SHA-256: eea161acb974bc9cae742f9482f8a5486e3e0af08f7dcd435ca385b5342f7be0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://oniceh.ru/uplcv?utm_term=what+is+blue+whatsapp PDF link annotation
    • http://auxerretv.com/content/public/file/sekuro.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b27690564c2---25906263275.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609030e9f1c26---98850898564.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/tovutawunakirezix.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/82165857371.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/58190331978.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/42004070955.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/d97fe7beeacb74fe2bf3539320dde588/3841797625.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/foxitavagatovotut.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/dumisiv.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/63fc4c8e264b114c5296884c5fdf6d88/87906591282.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab05f64e4c0---45187815968.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6610dccb86---36407304512.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/sapix.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/lowusuzax.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/85793515776.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/p10kl4o8kv8epoft8pp1783r2i/79866363079.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/7vntcg8ski6jpippdp1qnfe15e/wixarutajukekinixijopali.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/kuwewafonixur.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bf49be3bd8c---kamozepuriguw.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6368944b178f6ae42dc6d99bd174f4c0/suxijexizopozufipu.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/latunufojigilusojunupix.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e6f07c8cf6deb7d5754adec8028d6140/47268706897.pdfIn PDF document text
    • 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_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 18064 bytes
SHA-256: af9eb4b30187b5a19a6358441c6fe0e3f04e53bef0059611ad02fe0400504c83
font_01_sfnt_off000116d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF0 10344 bytes
SHA-256: ed78ac813020ae2ff2c6f214bc5ba4d54a20c60fe9fb2cb8a17932a975d6e998

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