Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd286b48f5be1ad…

MALICIOUS

PDF

74.8 KB Created: 2021-09-08 03:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b943e2f6cdb07272f59e265dc7ed8910 SHA-1: b6eba68b98c1d6350817110c577c25fae4bfec48 SHA-256: fcd286b48f5be1ada072f1a13a4c2bbd2a5128e4773d9ea999d8812ef3548f6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/8c30726b1b434bdddc0134c83654bada/43361081239.pdf In PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/h572u4fgn74t9hjmj076blbo0i/wiwewulezufuvuwadosozas.pdfIn PDF document text
    • http://hncastlecable.com/d/files/10076448314.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609876ffd9d31---fadiselasukotin.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5moj3labh7ss8ikhakss1bg8qb/25584837120.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/831f0bdc0eab9321b77dc9b9ce4e8582/13876534710.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/dujezuvexojizotilineke.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/dotux.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0074117672---kulakedawa.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/93cfee07afed9a9546ec713e2bd70e11/8456165639.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/29318124243.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/tusulepalevojotomasopup.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b1349e96c---pured.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/e4268f861db6097f517915af3892509f/59281832560.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf8b9a074e---3525896572.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/zedotepijudaj.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/d4f23938c68812f79196c1f82d51d17a/9992041312.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/7316466832.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/xisimitufadipa.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/gjdvefvpikummvoq27941e4m05/fikikep.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dc2541cc243---zonavijogep.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/lowalonuxuwa.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/69740223342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=adjectival+phrases+worksheets+pdfPDF link annotation
    • 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_off0000bfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBA 17244 bytes
SHA-256: 789546c046e31a48115089abb6e2e168450c788afcdecf7c5c4224bf9a23a932
font_01_sfnt_off0000ebbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 10968 bytes
SHA-256: e79a1311ddef6ede6e7ba2039b4105e9cb19f066961c41ecb039fa6fb0ec6d05
font_02_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1