Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac405a46323ef4a6…

MALICIOUS

PDF

84.9 KB Created: 2021-06-29 05:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bcf5ca5728f5ffcc084a57456080d7d SHA-1: 33343ca8e1971726bb65b233931842540deea733 SHA-256: ac405a46323ef4a62dbaeef29a2881a665beb97eddc053a6b2dafa5798fa802c
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, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support a phishing or spam campaign.

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://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6f32d4a3db832f1bbd75adc47ad9a9d2/tiwaxemoximuzikujitajiv.pdf
    • https://debcopharma.com/userfiles/file/worivoketezijewarat.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/d1ae5b0ad40c22da462ba0e5a4c6255f/70702434937.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/f8df05201a3a7bea2409d56099d33e44/72864751864.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5ce935ea5---vexidiko.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/690f2984inpllfm0vvedmlchp3/31008541044.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/66dd5a8c6bce1476e2f490289dfcb0d9/bowuxagizefixa.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14a744a0b0---fujano.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/4lmv3bkeqpub8018s43o709s92/89141427718.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16076463d1dff8---pelimuwemuzotijazafi.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/92aeeba469f1e81a1f517d2e067c16ec/82619393645.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/284c0f4ed7acaf41bb8563146131ad9d/70119759066.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ts37n7u6l0hs07ogub1ollquod/vutuweke.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2e3add100---perupufodekovikogivo.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14d3c3766b---vusudaralimup.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/1debecc870f1a47e0a7feb1f2099a3ba/sugutas.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/ppohttt3aq9qefcqb8640f6kh4/87755500496.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9f58ac2b---zodagigivimasi.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/1b88d725c925a31fe8361667c8bc770c/21616745272.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f192ff13---lakojojelelovaniwilit.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/524fedc7dfa5750e780582c9580274f3/mewadoriwisimiwot.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934996984b3---komokodogepofewadabizelu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=lax+to+bey
    • 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_off0000ea8c.bin
8f5ce86fa46cc5927c4a004006b7565e3fb5fd481641f620d17dc0ca8cd56022
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 17676 bytes
font_01_sfnt_off000118a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118A9 16792 bytes
font_02_sfnt_off000130bf.bin
292772f05269a83fde3e2535b5331eae67ffae0d594f9cf11a0b538c5b27f2e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x130BF 9904 bytes