Malicious PDF — malware analysis report

Static analysis result for SHA-256 e833718d062e87bb…

MALICIOUS

PDF

81.0 KB Created: 2021-07-06 19:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b21eb4cbfce28e372801ae48d6a42c6a SHA-1: f6e179b7dc0b1bd89691cf4f65bdc49e4f0f6ca4 SHA-256: e833718d062e87bb8515a3b1890b0780d9be06ab387566f62d283d080e50e68a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the numerous external links are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://garglob.ru/uplcv?utm_term=blooper+meaning+in+malayalam
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/nmg1c225utqnhiu19kbfvgpi21/20209009873.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841572db069---99999490522.pdf
    • https://vietucmould.com/img-vietuc/files/94895085674.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/abee0d2c6042eb0d2cf5f3f4aac891de/43948279877.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609423e9f1637---2693030906.pdf
    • http://podlahypilat.cz/admin/file/vikenukukovidu.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/694b2fc3b90cf2ad23eecb9002766c86/32383770962.pdf
    • http://cana.vn/uploads/userfiles/file/vitidaxoderuzaxeku.pdf
    • https://alyosserspneed.com/userfiles/files/wogurajesulexoji.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/vnvfuh7cn5q4138m9s9h057sjo/rezari.pdf
    • https://roomart.uz/ckfinder/userfiles/files/gigugavokafokekolaxikam.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/57e5d9e68e6e58d14899a9abe664acd9/70571631888.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3169a23b---34431928735.pdf
    • http://flirtproducties.nl/ckfinder/userfiles/files/vupimapak.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/h2kqj5c1984u12srcp00rqr7p3/20182963344.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4e0098e4c---vagiwipapu.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f371245a2f---tebuj.pdf
    • http://seednseed.com/admin/fckfiles/file/bexexitetemamajamisefu.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/evci69mpe9rjunorkbqrg8c94j/57624434849.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/f9579cf6b4856fc30cd4e366d20b8d82/30660281081.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bee795ba524---wumijesumevonax.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/pscv16eft8v7qvsmuhphjj3nn8/14073637031.pdf
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/79503568403.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d70c.bin
9541d80d0e16912c8c0a34c8e5a65a7c00a47035e66211f083558f18280fc64c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD70C 10496 bytes
font_01_sfnt_off0000eee0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 16792 bytes
font_02_sfnt_off000106f2.bin
43172edc8c18d617e6a81adbb393cd07f49798aa2973ad5cc76392858f23e1b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x106F2 18388 bytes