Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a066960158a9d6…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 02:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f53440786e6f45b51680b6fb49604a3a SHA-1: e165153a854263b708dad6eafaba3efe4ca71b3c SHA-256: b9a066960158a9d6dbc4086e8db928fe67e6a18944c33b99876d6500530f0360
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is being distributed via these links. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://chcial.ru/uplcv?utm_term=c+interview+questions+for+freshers+with+answers+pdf PDF link annotation
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1612012a836fec---16365225899.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a515a8816---divazikuwitoguwoke.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608300a7c839c---85223912876.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160763ba390e3b---92261365582.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/a2d46816ecdbaf49ac6082be80101d22/winuvu.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/vadiposuzodediguj.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/jeperalexefux.pdfIn PDF document text
    • http://jump360.co/upload/files/20210907050317.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609887289de1c---85191983865.pdfIn PDF document text
    • http://belst.by/upload/file/35076990780.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/vibepelel.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/tofoxokixanofuxaxalok.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/32207847913.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/69764053006.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/lonifuwaxoxilonolupeb.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacf2990f93---ragadeju.pdfIn PDF document text
    • http://tayles.com/uploaded/57820334109.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/e5lgbaup0bo7f0e691es7902h2/vefunavorulovokizisimeked.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/4e82d5b740e2b9925f0756368cfff8e3/96977369681.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/ruzarebavemis.pdfIn PDF document text
    • http://soles2walk.cz/data/file/kamilururotowe.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/35t9fg1s6rc7aim94mjbmuvdti/44114703322.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_off0000e611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE23 19428 bytes
SHA-256: 62487d4bf45d1184668aa331f141efef1435fce96a36a1860a416940545bb3ee
font_02_sfnt_off0001312e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312E 10976 bytes
SHA-256: 8456fd3e5838346cc8346d2a11de9aff4263ad8c68b8235fb57a2d5e3bf2b313

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