Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b11effed6891a66…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 06:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed138317f6d2d55b2e082be1817a5703 SHA-1: 5907dd49282814c0209cd75e7e7b0d404af34237 SHA-256: 8b11effed6891a665147718bd172142c77d565f67029d4dd844836cf894879db
184 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting, with some links explicitly pointing to PDF files. The presence of a 'download button' lure and callback phishing elements further support a malicious intent to trick users into downloading or interacting with harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xtremefitksa.com/ckfinder/userfiles/files/viretutepoxol.pdf
    • https://www.borzabadi.com/ckfinder/userfiles/files/20067570122.pdf
    • http://quaint-house.com/images/blog/file/porotowirijake.pdf
    • http://alwaysshine.com/fileimage/file/xutowexodelelesa.pdf
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/veremo.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f95aee6edf---56305260131.pdf
    • http://studiopignotti.it/userfiles/files/34021742535.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/5fc40b6ab58865719a35572b4b9c5ecd/gipubed.pdf
    • http://zatoodesign.com/userfiles/files/witibuxo.pdf
    • http://albino-pitti.com/pub_img/file/jupezukot.pdf
    • https://dcimx.com/files/kivuj.pdf
    • http://dongphat.net/upload/files/xasogevizegopuxisovase.pdf
    • http://macro-e.com/app/webroot/userfiles/files/jadifixuni.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/97309696826.pdf
    • https://autoroman-service.ro/imagini_ws/30399570689.pdf
    • https://aildf.in/userfiles/file/24913705531.pdf
    • http://likuidart.com/files/ckeditor/files/51718186055.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/b8qr9j0p3neb6nfi4113mf9409/xojaxodiwisoga.pdf
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/nipuwifazerefapel.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/sndgbpka5n8305dm754kp6t110/22135138200.pdf
    • http://autobedrijvenindex.nl/images/uploads/vavevulu.pdf
    • http://orsini-blasioli.it/userfiles/files/66500567528.pdf
    • http://gildiamasterov.ru/userfiles/file/lomumuge.pdf
    • http://bilafafafa.com/shopadmin/upload/files/jewefesujuzaliwelolurav.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/71814574839.pdf
    • https://vidaleve.ind.br/ckfinder/userfiles/files/xumamuxotejazolufekebel.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=download+file+ppsspp+dragon+ball
    • 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_off0000de4a.bin
2c1ecd8275e3eec1975625f9b6107d92f9e26963b9d970263e36b1153547bfaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 10800 bytes
font_01_sfnt_off0000f6db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 16792 bytes
font_02_sfnt_off00010eed.bin
96a9a00ddd26910c3d7e116f0838bc79b73bcc84933fce19596cd15afc21c2dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 18024 bytes

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