Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92d912aef7d5d7a…

MALICIOUS

PDF

88.5 KB Created: 2021-09-02 09:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1923f2361b09d3e69c0ce55a02498aa SHA-1: bc812598241cc1f643a71c8f92c7584569d4a001 SHA-256: c92d912aef7d5d7a6e69f1719f0891fb81cd6eebc02687689b9c699903acb55b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised websites or disposable domains. This pattern is commonly used to distribute phishing content or further-stage malware. No scripts were extracted from this sample, but the presence of numerous external links suggests an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=talk+about+your+dreams PDF link annotation
    • https://acronimocostanzo.com/userfiles/file/38093454372.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/tu7ua7tjrftm53isl2me58uqlg/71367548520.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/60453339391.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/sujuxabagivaxazuluwo.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/4e441cndqpib2t2m4ofu3b4ea3/miferozagiguza.pdfIn PDF document text
    • https://ewt.cz/res/file/11560952691.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/b9f00c5517ce6d7adbe219ccfe387479/sebulofilavu.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/r2j3t5a8nlvei7ebi2n7a6gsk5/45749538785.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89a1609eb---tudube.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/a12f77a9dbb405e142bbf50ee22bd82d/39657515903.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/liremisapes.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/68987873129.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/fokavokoralowozanun.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/99063216672.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/29485114603.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/72051339599.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/65572470445.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607533bf6a86a---56272801147.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210520054110_z0goc0.pdfIn PDF document text
    • http://co-mit.com/uploads/files/lilebebegamidezopipew.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/sdb3rq8uqk6a8456od4umq4rde/3299306908.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/13578297756.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb00e2b299---ruvoduzavakaxonovolegedod.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/kalezezowuborovolovovel.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_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 17396 bytes
SHA-256: 1a16fb54e0c39ca7b9de09ed139521069cd303ea8252c04b1ec66b08c4691500
font_02_sfnt_off00013a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A99 10624 bytes
SHA-256: 332258474aa3b4edfb98323677f21b8a25b5ba0282bbf952b236904acb1209cb

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