Malicious PDF — malware analysis report

Static analysis result for SHA-256 641c33787119053c…

MALICIOUS

PDF

84.9 KB Created: 2021-06-28 08:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3934c04cca6cc13fda737c3af094b74c SHA-1: f17f4e5fc09ac46f8a644014a839ab4bc4044678 SHA-256: 641c33787119053c33588a7c38bc043d3d24d9e80ffe6db5de29547d55e6efb7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users to malicious content or phishing pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c85c591bea0---57388689861.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/r69u2f93dqbrb8m6erqbqv8ng1/21059912902.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2758198cee---44862182564.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/enjhuqaa4e1mgct2c2dk90eh5c/13975196495.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1g6mikqqg3i3ad9ulgukpqv8v2/depukajumopegoboluniki.pdf
    • http://nemeckystrakac.sk/editor_uploads/files/gukisevorebulapasumelep.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/1ba04nioj7il96ku7sot8o0vdu/2256200891.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/9d08591dd8327c7627ba0c5d4ea90b1b/86000814912.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16088f87201242---34259404700.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/e19e8ffd5dd419ab4b04f44e77c804ab/zulolunuxojusu.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dea9015ed---suzawuf.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/f783b046c66b6652c3260ceb9cae1712/loviribari.pdf
    • http://lungshingcentre.com/userfiles/tidagixupen.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4b0evg6eqgq5vdg7lp2u0jfjoi/69880869713.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e9d92a5d6---zudalewokidetepig.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/uvfq8q2rcdmb65r91ki1kas8r5/24973957559.pdf
    • http://adhdesign.de/userContent/files/20210620205315-22009701074.pdf
    • http://edu-family72.ru/content/images/uploads/file/8495756477.pdf
    • http://atut-biuro.com/uploaded/file/30481587919.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a429819d0b0---goxijibasokukomapedateg.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab58f5724d4---52701740486.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8751c11978a8e8cf307be33dc3874109/sodibibemivarevezejanor.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=life+game+tokens
    • 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_off0000eb64.bin
4ee3e507d847cef1218ee4e30565aa1a44557ecf7366bec29e9911c7a9ac2897
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB64 10460 bytes
font_01_sfnt_off00010327.bin
2492fb2da9930ee7a8f2794b6d2634c4952a05043448d69fbfa39d235db2c49c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 16832 bytes
font_02_sfnt_off00012e94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E94 16792 bytes