Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d82f49bb4e2e2b8…

MALICIOUS

PDF

67.7 KB Created: 2021-06-07 15:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bb791a29de6b8189d33e936b889d5fe SHA-1: c59b9383574dac161ebc72ae7c2360a580f74a2d SHA-256: 5d82f49bb4e2e2b8d9d27f9784b48851e70cfc9a8bc49ca76db28483ceb887f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several pointing to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, but the primary threat appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=simcity+buildit+apple+cheats
    • http://fzcce.com/aimgs/uload/files/88514405632.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/84387174789.pdf
    • http://ahkjt.com/upfile/file/46482440200.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16feda2c7---ralegezadikebiba.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/g9doc44mkhf4v74h2rh7ee1ong/91394477988.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/632412165a38fd0408d9b3e242eacdc4/mezobituju.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7d25cb40067603777f2fdb7ba4a64b91/muzavifuwu.pdf
    • http://reelproductionshd.com/userfiles/file/polipefa.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abed5c892cf---nasunuga.pdf
    • http://industrialdevices.in/uploads/fupowulelawuwisozese.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffb637766d---tizuvosiziw.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608062c4169d8---suwifowipeme.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4d9967e5---kebirofilavelebume.pdf
    • http://aliceinformaticasrl.com/user/pages/71921323900.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc67.bin
baaa80bc8d63a6a179e627e1719efdf466f29b71b5340d895e4768d465bebadc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC67 5564 bytes
font_01_sfnt_off0000df2b.bin
ac32b4c890247439123dfbec3ada127291bb50c462e606e5e8fd0489de41bcca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 10204 bytes

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