Malicious PDF — malware analysis report

Static analysis result for SHA-256 3402e0a9cfc5fb2a…

MALICIOUS

PDF

80.4 KB Created: 2021-08-23 09:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c29b04de1f60f99f027be2cda05308b SHA-1: 0c5c8be1055c2c59af6d95a4df28a084bddf2d0e SHA-256: 3402e0a9cfc5fb2aecf5ba30bef7cf7a6ee64acdd79c9a944e8fad37ca69e855
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a malicious link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://thekitchendesignstudio.org/uploads/files/31860773663.pdf
    • https://gregor-biffiger.ch/userfiles/file/dinezulutadufopiwagub.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f4e63d69992bf57ba295cd32c09c8f45/dijuxosodetigonul.pdf
    • https://ahha.az/userfiles/file/favaparubid.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a843ec4d4d6---serup.pdf
    • http://whatcanidoforyou.eu/publish/file/61575901485.pdf
    • http://garantc.ru/userfiles/file/44949803870.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/iegne6uleup1s54bi6kfmhkj81/14448913241.pdf
    • https://shipnhanh247.vn/asset/files/wuzuzududelizefiweg.pdf
    • http://ejmk.com/ej/upload/files/89141374053.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160904972d7871---pumipulexemozodigimo.pdf
    • https://baobihungphu.com/media/ftp/file/70289627935.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090afd52fe41---sepuzabuwawidaxaxurixezo.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898e22a7c33---samafara.pdf
    • http://xinxinhouseware.com/uploadfile/files/99910884997.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/q7jo7jpjc5cc03a5k6fb3jv4jj/mudonuturewasadaxupa.pdf
    • http://life-worldwide.org/assets/uploads/files/rubiz.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/f1opja8m6ukmq8lgg06hetruis/40765691000.pdf
    • http://mini-garden.ru/userfiles/file/jodipozijokubawuxetuwo.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/978f4d1c6e84577da7adb2cbb56ed4d2/luxovodafug.pdf
    • https://beautyyaurient.com/editor_upload/file/13421363659.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160935a73e1272---rupatuxamag.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ee0127806---nevixogozanaruvimunulef.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gaming+intro+template
    • 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_off0000d8e4.bin
1935f8730488c9767086cecc846b66c9e9e7d430bf67acb0146c5f10023eae59
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 10468 bytes
font_01_sfnt_off0000f09a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 16792 bytes
font_02_sfnt_off000108ac.bin
bdf2ccfa60bab7193436984d70fec76bc8a9c15c3d1ab14fd3b655b87855c495
pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 16464 bytes