Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5263e2b8262b79f…

MALICIOUS

PDF

93.2 KB Created: 2021-06-28 14:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16980e1481291944e72687f8bfe19578 SHA-1: 579d29d8c90abcb2c27c2ab0464f0fc06cb40bee SHA-256: d5263e2b8262b79f808dff865c28f95943bd65d1c47d0f82b60fc7664597d03a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://texmet.pl/userimages/file/fugurudafisebod.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/lbe2c86npc05cebp30doq0dh2t/92207135378.pdf
    • http://kubabus.cz/novy-web/upload/file/mukewivapovejudununojuza.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/12876741349b64307f971587e481c293/47846044696.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/fejajejegeferipolugoji.pdf
    • https://fertilizergranulatorprice.com/d/files/82688915458.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba058123ef8---vovijilerakakezusesopixo.pdf
    • http://curry-box-deluxe.de/userfiles/file/99664128084.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4260d5dc8f44e73cb5f1014024852be0/vomubukudegasubuz.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607212a10242f---vusamaselo.pdf
    • https://sindonis.com/userfiles/file/75196078417.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/885cca02d156d576462371608f8da00d/besamesakidiga.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e3884c9c8---satadusiwiromun.pdf
    • https://premium-house.uz/images/file/sezagejewoxanotulofimaje.pdf
    • http://agendaalzheimer.org/files/galeria/files/92370739390.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a644e5e8e9c---87773896074.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ccbe5d77f---76011233451.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085e05368dc7---goradudux.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ee9295fb7---41184988933.pdf
    • http://wenxuezj.com/images/File/52613753532.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/n77f41ob55ovr21uipo3d85g86/99728812021.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c939e3b2d1---5793936706.pdf
    • https://plasy.com/uploads/file/50347001514.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=profit+and+loss+statement+example
    • 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_off0001051b.bin
d2e9c45a3dcac5f813bbf30d355e7a18d0156d9dd3c737c8daf9a4f7fda4b8b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1051B 18124 bytes
font_01_sfnt_off00013501.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13501 16792 bytes
font_02_sfnt_off00014d18.bin
69962b06134d96b041b4c6d57ead90b8d691e9bafc43bb126ba1567ab292d5ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D18 10760 bytes