Malicious PDF — malware analysis report

Static analysis result for SHA-256 31752ab8335215f5…

MALICIOUS

PDF

68.7 KB Created: 2021-09-12 11:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2bc38ca426b63f0545d81b7413a323e1 SHA-1: ea83799a176aa6a4e9af8281bf5627c612467c8a SHA-256: 31752ab8335215f5161d2087fa4eb24b11d37f56f2aeeae6086e3b6bc09e05a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of external links and the nature of the heuristics point towards a phishing lure designed to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=download+gmod+android PDF link annotation
    • http://tieulongcopro.com/luutru/files/fogudegoronuvanebivin.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/jevogideteroz.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/jigivopozekikadija.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/pi916n2efbnvb010bep9s7vkq3/46590576070.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/ragujevixo.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/32285037137.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/zawivumumizafevebipute.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/11079675198.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/61611688347.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/bidinu.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/zokizupe.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/430c154765f88a9e64f8ec5fbd16cad7/22704843525.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/14882226551.pdfIn PDF document text
    • https://anandalaya.in/resources/file/bukibi.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/85015707059.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/96039941935.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210908055045.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d89ad9225d---38281087829.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/13872950028.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/56212585770.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/56452905118.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2e8809fa7e7c9ceb4fc10781d99aa9c3/56052783733.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_off0000b0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F6 15080 bytes
SHA-256: 6a3b4128d717d4ba013ac609230f890d4c8e3f3e03ad8fc248571552ee9fde0c
font_02_sfnt_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 10280 bytes
SHA-256: 9a7dc0be7ebb11a492c06fd231093a68ff7c20710ddb3df0cc06333be6fa1615