Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f03fa3cffd6625…

MALICIOUS

PDF

91.3 KB Created: 2021-08-11 11:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f58a2f4e63f3941ba2790bd21a3f3e6 SHA-1: ddf534735d2658c5221cde2cfc99b887320218b8 SHA-256: 63f03fa3cffd66251a1ab49596bc76e9e873614dd7ff83fac2878f8f7fca47f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of external links and the overall heuristic profile strongly suggest it's a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://drafthe.ru/uplcv?utm_term=%D1%81%D0%B0%D0%B9%D1%82%D1%8B+%D0%B4%D0%BB%D1%8F+%D0%B8%D0%B7%D1%83%D1%87%D0%B5%D0%BD%D0%B8%D1%8F+%D0%B0%D0%BD%D0%B3%D0%BB%D0%B8%D0%B9%D1%81%D0%BA%D0%BE%D0%B3%D0%BE+%D1%8F%D0%B7%D1%8B%D0%BA%D0%B0+%D0%BE%D0%BD%D0%BB%D0%B0%D0%B9%D0%BD+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BE PDF link annotation
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/q42bld15pgotf15g3qv76pd86e/43403649430.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/39915174655.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984766a3b8e---kakugasiniz.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7adb1dd1b---wotam.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/61956947031.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/55824073625.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee42d203436---92924153283.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/zeguxetewipigado.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/lokarila.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160721045d1852---fojibezemanu.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/zofasidafevara.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b494511a6feed0b2d61d129bff829cfe/2910865239.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/puzedop.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0319e38048ffd3aad12ee3db70f3c354/fobad.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16086a91160d34---tuwosototav.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/18071631179.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/xujevawasixosijiro.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/gagonajewejerebenibisafis.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/49773656047.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/m0gqo7vu3pgt4jba2bkq7sea13/tisofenowusugato.pdfIn PDF document text
    • http://midel.me/userfiles/file/riruxibubew.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ada4c94da5a112e447543bd48a5752f9/60570838.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e0f56479a---buvipafuwaxum.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/481ecb55ae09966c377c2e2f296e1d51/48353853677.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_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 11320 bytes
SHA-256: e839357d514b201c9bbf34269f53a40c297f9c12c7f54e990d6ea874ca82d4ea
font_01_sfnt_off00010b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001235d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235D 22824 bytes
SHA-256: f8406dd786c84e7bb0e620dcf43382272ba441618322b3430320cb34df4df631

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