Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4c0d99b7e6659c…

MALICIOUS

PDF

81.2 KB Created: 2021-08-19 15:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7c69309b2afff138f21b4b525417baa SHA-1: 9f5ee96a5f746ac04753be742bd6dbbcf1b7e3bc SHA-256: 4b4c0d99b7e6659cdcf8624a295726b729925bde83d9bab38bed150c62e89dd0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript and numerous links to compromised WordPress sites suggest it's designed to trick users into downloading further malicious content, likely a second-stage payload. The URLs point to compromised upload directories, a common technique for hosting malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74536a5fa9---39673464776.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/v17v80he3jomn32i1lmp9kgv0e/57085790468.pdf
    • http://gorisum.net/fckeditor/upload_file/file/94518772201.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d57b7e90f6b---zefazigugaruposut.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9aa4535dfe---54261122792.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a65a2121205---86304869962.pdf
    • https://ferdavagnar.is/images/fck/file/99640441384.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608084351b38f---nekegojoxosusififiruk.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160e6018ed3d5b---22456049517.pdf
    • http://ventexevent.se/uploads/file/dobivetumasezebadalegon.pdf
    • http://solamsys.com/userData/board/file/27221146804.pdf
    • https://livre-art.com/ckfinder/userfiles/files/9772346910.pdf
    • https://gencerenerji.com/resimler/files/viwib.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607db6f825530---limazu.pdf
    • http://edgecs.net/documents/xujadagerofipobe.pdf
    • https://budapestpainter.hu/ckfinder/userfiles/files/doxono.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/73a1535a3db73fd7f975e39ff8d0d727/tolanujevufoxoxusijike.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a281cdf581---fodavumogidulenuxesin.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071c362daf0e---38356794458.pdf
    • http://ontsgoi.shop/uploads/files/tavezasagez.pdf
    • http://alibabashipping.com/userfiles/file/37419769463.pdf
    • http://sicilalluminio.it/userfiles/files/92343146577.pdf
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/kuwivomizofutonopex.pdf
    • http://cobe-ing.it/userfiles/files/62907001988.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fd8a309ac---82433732645.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=chandni+chowk+to+china+hindi+movie+mp4+download
    • 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_off0000d5f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 16792 bytes
font_01_sfnt_off0000ee08.bin
35b86b71bca929ff38c52130797b87a9db41770d1891e755c38922f2da7fa5ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 17200 bytes
font_02_sfnt_off00011b17.bin
ebd73f8f02ebf3a18cf9d9557c0de6d14b9b57d80a3cc12a710071723b1a6395
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B17 10864 bytes