Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a90cc1baf800e3…

MALICIOUS

PDF

86.5 KB Created: 2021-06-27 03:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f680a611199d2aa0c067b7d4ff69891 SHA-1: fd96faaf67163e47f434f92c0962da615f78063f SHA-256: b9a90cc1baf800e3f85c71323fa9729b7e78215cededaaea4dfc6a9e022aa621
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple links on disposable or compromised hosting reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/334c268c991f917ac3e8b0ee3a4a91b6/87248341128.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078002d6a4d6---72878921958.pdf
    • http://goodwill.as/userfiles/file/kefutexanosadagoweragodim.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/h4d1rr6seu6g5shvipkveao883/64365274423.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/9003674e259694069aba756a8c9699d6/92089149402.pdf
    • http://aytekinpolatel.com/image/files/kugetadamemujemodamifapof.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a712a74d095---69560905439.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/03901256a2c95ea6d4ff67ee4af8b7ec/pusunimitulug.pdf
    • http://canhtoanland.com/upload/files/53762973426.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/1794ql199mnh713h757ug0voa3/demovisudewasudufa.pdf
    • http://trendymamy.pl/userfiles/file/20923541709.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/381313b29f99d50b43220851945da8c0/11191962761.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/7af9c851dd2c80320730339f579ed53f/lixava.pdf
    • http://akkoryazilim.com/userfiles/file/todopujotamomeloj.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/u56smedngeol2tidaj6t536r2c/gifolezukeguvijirij.pdf
    • http://sklepjola.pl/userfiles/file/komidolejosuzifexovop.pdf
    • https://habibitours.com/ckfinder/userfiles/files/fotonovimo.pdf
    • http://vce34.ru/attachments/file/27387785398.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa48167c8---84748859801.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c83d5904571921c789a384a79babbe8f/dukilagewomi.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/27614b5013414bc8a8b7a1654065a5bd/matuvaxirokasuzokotivo.pdf
    • https://sweetburden.com/upload/users/files/vexigefugikap.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e11155350---4708761733.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/4f15386fd7eee3d849f5ea39bcc8b88e/68850794282.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607421a10f935---dilitidadofuxupudenonom.pdf
    • http://szentdorottyapatika.hu/files/sigufuxezekixot.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/60aa811f0df858e41d562618c9931e60/sinekumipede.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=advanced+supply+and+demand+trading+principles+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_off0000ed63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 16792 bytes
font_01_sfnt_off0001057a.bin
2c70bad5796dc1bb87041a6b1bf941c1c3c716199a1587d86c2193b158377cfe
pdf-font-stream PDF embedded font (sfnt) at offset 0x1057A 11104 bytes
font_02_sfnt_off00011f30.bin
80c27dd031f9ca814a7db4b49cdffa7606e1bf5ba04ebaa9648b0881b7d39c61
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F30 17220 bytes