Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca84b3eefbb7a0f6…

MALICIOUS

PDF

94.6 KB Created: 2021-06-27 13:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bff8e928df998f21f44b09d179939940 SHA-1: c71e3202d93ee755d50e9e6f0049fde15557444d SHA-256: ca84b3eefbb7a0f626e7b95fffa22a82cdfbf1d4b2662e4e0597452173c80256
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The primary goal appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0d9e1b25f---tegepo.pdf
    • http://autodilykanka.cz/cmsimple/images/file/jiwoz.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1909bf55b---59806922291.pdf
    • https://mamap.in/ci/userfiles/files/39878152375.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0237996fd---168850651.pdf
    • http://banghetretruc.com/media/ftp/file/30180409554.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/864cca6dad65f77f277e2e6350893e91/ruxozid.pdf
    • https://btegypt.com/file/dekodovenuve.pdf
    • https://twr1115.net/files/fckeditor/file/luteratej.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a4e68f80dddfe6e688e00adfea26fd7b/35933459515.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3ce850936---kemetiwigogeraxo.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/92aea50bf77ced68a5cc8becc7fb9e5d/fevufuvukenuxoxa.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/c0sn7ab6lsvfb1j49lodjjeoia/wuduxinunupal.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ea8d451e6---1874860075.pdf
    • http://ghioroiu.ro/sites/default/files/file/nozuzere.pdf
    • http://leton.pl/userfiles/file/1712391608.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/6120b239c60de3acea1146e82c9d8c57/rubejosezinonisez.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/74287191906.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b26a77ebbe3---34888143129.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/fc4e1d1de1789f7456c3d96d15c59e32/pobufofunu.pdf
    • http://nowyhotelik.pl/userfiles/file/fegujutediseg.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1013ddfd4---77947564187.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=halogenation+meaning+in+tamil
    • 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_off000111ed.bin
38abf70ad5e9e01e9b96a0d22a16f67fd2b410329ee6965a3c14a66f317d0df0
pdf-font-stream PDF embedded font (sfnt) at offset 0x111ED 17084 bytes
font_01_sfnt_off00013ee0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE0 16792 bytes
font_02_sfnt_off000156f7.bin
9904149be9a3a9262d3db1ac4b7ecaa87982e8e1c1fdf0b66b41b1540624a757
pdf-font-stream PDF embedded font (sfnt) at offset 0x156F7 10176 bytes