Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f0cd5791db5d39…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 14:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e4cd9b9d7cdaccc05c3a9d8e4be14c45 SHA-1: ce738a13089099eb587842e3349f316e372bf272 SHA-256: 36f0cd5791db5d3911093cd84c6f83aeff11df664cbdcd7a68983be6ed601f2d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://chcial.ru/uplcv?utm_term=warhammer+2+total+war+cheat+engine PDF link annotation
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130bc12c6cb9---navevidelefetedekutewi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/muraxoselu.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/91533555524.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0d51ec76d---kanuxarepixobomom.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a80a1bfcc5---79705884135.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3c0d667dd---99971585061.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/52123209764.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/80226074765.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b9b4a31a4---norenaxomenagamemix.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe644f837---42960091399.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/59695633414.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/jufolepoxifufeva.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/fakov.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/reapfh3f06i0rfinntnd470ugo/17860469319.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/56323572587.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/sabosalinexujenobawapo.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/42443973164.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090907564350.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b1d5b8d8---48394297291.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/banuborigovetoleridir.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/kogote.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/31726976242.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/9caab60ffa24a14eafd347cec3f48575/tisulodamuvo.pdfIn PDF document text
    • http://trevorhannant.com/21679054537.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/nawirewakiwabolip.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_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 19852 bytes
SHA-256: ee94c73281a4f43084cfe19e12719cea3a547d6be0dd56ce7d7658ceb3f12887
font_01_sfnt_off000104fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D14 10708 bytes
SHA-256: f3cd2ceed8fe8fc5dd4a1180392789860e41a311eacacab8df6e41f549e433ab

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