Malicious PDF — malware analysis report

Static analysis result for SHA-256 859205c08297ba1a…

MALICIOUS

PDF

73.0 KB Created: 2021-09-12 11:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b93d3bab2155f4d8ac176a00e7fca7f SHA-1: 1ed19f89d08a1d992a0898c044e8a8e559df8c28 SHA-256: 859205c08297ba1ab30a22d8917079c5c03652323bded90d3e58df3bd4e4e238
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or 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 distribution intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=ejercicios+de+word+resueltos+pdf PDF link annotation
    • http://ecohouse-lab.de/userfiles/file/mijomuvijoxoguwekorelu.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/63201715771.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e590477d729d9904fae7cdb970affe0e/80166613681.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/jifube.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/konabilujo.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/wugovi.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613b06be8043f---30032953517.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/21603763554.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/kupelofazudub.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/2008197408.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161335d10f1e08---jupulodunuxazozogukukof.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/bokorif.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/jovotalolezanemaf.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/sazosabunarom.pdfIn PDF document text
    • https://jss-moms.si/upload/File/totodugovijaxezodenis.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/47746897289.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161364b9b54764---varixugasovove.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/midoge.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/19009530865.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/zizen.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///12322114320.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/20472425708.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/2958339841.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_off0000bcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD3 16444 bytes
SHA-256: 96845ab23b9a2579f5f6e54a52692ef159197cd0fa19b56299ad7d8bb4b3f206
font_01_sfnt_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 10644 bytes
SHA-256: b3df9648ae98693ac307236efade031ef6a4699fb43589b72cd153a2d7cb2749