Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db9bbbe332a714a…

MALICIOUS

PDF

89.5 KB Created: 2021-06-27 01:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6173df829c036226a6683697fa58943 SHA-1: e3b8cd6117526d367bcc1038b9882979c47ee443 SHA-256: 5db9bbbe332a714aa3604554ab06c2adb64939fd0c26a198e1e2ed12e7e3d459
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Multiple heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://ipmarketing.net/userfiles/file/jivejetubadota.pdf
    • http://automsystem.com/UploadFile/file/20210523052021370.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5387141d26---zalepajuli.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d1692e785---dibil.pdf
    • https://ooo-kenk.ru/userfiles/file/56832401471.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/512b39e12a355db8dfe1b0f8fa26c32c/zomorisuxozomejoguwos.pdf
    • https://www.leeja.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d4b1827ddafb16d58475b66bbb4503d/40804886758.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d40d243d6---8177423543.pdf
    • http://phoiinnhiet.com/images/uploads/files/folenubokunifopuvikisak.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/71143669860.pdf
    • http://thsport.dk/ckfinder/userfiles/files/9649293129.pdf
    • http://daoltrading.com/userData/board/file/fabaja.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/a29b299d89ef5b5c0735b5f14440686e/15014525178.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c10dd3e2c---49004074380.pdf
    • https://serini-cloud.pl/uploads/editor/file/33599237644.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080431a29c25---fubuxewesifukiwosel.pdf
    • https://stef-nancy.fr/upload/document/84802388954.pdf
    • https://tangente-mag.com/img/file/kakanavibixom.pdf
    • http://hotararicedo.ro/files/files/pupagekufe.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ceb09b29rktl0k45vbm6206h85/71974928934.pdf
    • https://novahealthclinic.ca/userfiles/file/kadosuwudujesutewidos.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b306e2390---kitefebuvafas.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a456ba3bb76---pujijotunak.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=rtd+types+and+ranges+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_off0000f972.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 16792 bytes
font_01_sfnt_off00011184.bin
602fc0455315a5ef456b3b7e839ca72547ea51e86efae08dd8411d0de552d557
pdf-font-stream PDF embedded font (sfnt) at offset 0x11184 17888 bytes
font_02_sfnt_off00014098.bin
f86e8507412caa3619c35502fa6cb890ca7bee6bf9150680026af86637e017e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x14098 10576 bytes