Malicious PDF — malware analysis report

Static analysis result for SHA-256 c902251042940702…

MALICIOUS

PDF

107.9 KB Created: 2021-07-29 23:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9a4962e3ca068dd9396cc19a4fac0eb2 SHA-1: c469fc4482422d830ae18c94c686ded6e78b55ec SHA-256: c902251042940702a96d7d37b26447f6bfff0befd21d486f789b444982c0522f
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to download further malicious content. The presence of a download button lure and callback phishing elements further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • 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.
  • 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://medvor.ru/uplcv?utm_term=money+cheat+gta+5+single+player+pc PDF link annotation
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/56750567317.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/54561814152.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/94557480599.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/9911798590.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/25191349625.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/r8jriseo4iedg9sc92tmob9d4t/gegokivinovunig.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/68405019909afd65282ed68af44db5fb/vitenamuwimanobas.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacbadb42a---36154950126.pdfIn PDF document text
    • http://envigest.cz/upload/file/kipetanirugozifuda.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160987e520024b---vetigemefugapagemog.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f611db642---15946102028.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/puvijajuxidanuxagipomu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160989c9576492---fizekabukezuxoxepu.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/zezoxuwiv.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/75611219276.pdfIn PDF document text
    • https://digireg.se/upload/zogojejofufaxiloviv.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/1507953b5ce42bbf70b5e550e0cd545f/71168869578.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/91208219523.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071218523f5d---jalatuzafedovorowubaxo.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/96784767933.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/39083573055.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/694483f12116ef78e617ee96658f9b85/81386105040.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001430a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1430A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B21 10896 bytes
SHA-256: a324ee20f308972e966091cafe3e8a67d1a67b98cc663db5fa49372ae08b496c
font_02_sfnt_off0001745c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1745C 17448 bytes
SHA-256: 66ee67a699908279c4e3e6d0497d7a724a4e5ecc0816c41becb3dc0b1b0273ab