Malicious PDF — malware analysis report

Static analysis result for SHA-256 976e306ccf972c80…

MALICIOUS

PDF

84.4 KB Created: 2021-07-03 08:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c4d39cddb4db67473918b590eadbd814 SHA-1: c9bb9cb50f44a8036e399c098748e967d0357a3b SHA-256: 976e306ccf972c80edbc19bc9c3a6b0c24b1f87fa4d9483bee3e3311c7edd069
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. ClamAV detection and ML classification confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=treatment+for+pulled+muscle PDF link annotation
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c76acc7134---kadezasavepewexumuku.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/rikizo.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/f2m4cd4sfkvte0oeskonsvj8ka/75420712523.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/39070585843.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/vodisusupefenozewazogun.pdfIn PDF document text
    • http://quaint-house.com/11457220554.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/mv2k2tlt5bos4t3h6vq7tdegs1/novuzagurejaz.pdfIn PDF document text
    • http://poorclarescork.ie/images/dababukibidomagali.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/todagajexe.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d3b4b83e4---62088496825.pdfIn PDF document text
    • http://qzgj.cn/upload/file/benas.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/nupeberojorujiraravuv.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afce8dec597---44073162101.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160858c70cd67d---luxuxalukesirewo.pdfIn PDF document text
    • http://rsst77.ru/upload/files/33301503542.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/zejogemaresipupokixebi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b156e1b3a3---10317517040.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/82e08a6aa123fecd06a6106f241e1378/tonotoviluzufewonan.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/wukirewujeseveb.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/tupitikalazosuxu.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/cd26e3e8bd53f8ca554a7d069df0ed77/63159782871.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/49348870022.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/d4bd7dd841d3a51e92f179091100a1cc/34036473813.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/9c532c652850780d5f20d3644bf1ab63/fofejetakovikorabeposi.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/29489705043.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_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 16732 bytes
SHA-256: 55f7f8f693130afba8f7c0489394e0267af83b828b0d3e0bca1f2572768b741e
font_01_sfnt_off000113b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B2 10752 bytes
SHA-256: ce25eb4fc223975f7bfc3410854b9ec50c98815418a908e82e1a36335f55c1d3
font_02_sfnt_off00012c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1