Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b15f7c3b82075b0…

MALICIOUS

PDF

88.0 KB Created: 2021-06-28 06:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f6392d0d140def64c7df548343ddc3f5 SHA-1: 45d158dbb751343fbcd814369d9e07eeb46556f7 SHA-256: 5b15f7c3b82075b037fb6aec7fa516534687bef04df49e90e5b0783027d8e0c9
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and potential trojan threat. The document contains a link farm pointing to compromised WordPress sites and a URL that appears to be a download lure for a game. It also includes instructions to disable security software, a common tactic to bypass defenses. The presence of multiple external URIs and the security bypass instruction strongly suggest an attempt to trick the user into downloading and executing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=tom+clancy%27s+ghost+recon+breakpoint+free+download+for+pc PDF link annotation
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec55698359---83035857629.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/3779464513.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/44835876580.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/773c1c360f3cd84ec7ce3a6e667a5be3/83546949682.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b578ac8acfd---kemotogifonisiniviza.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/rifeve.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/supifa.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/0dd15cbca6536eed1d48b94004591758/belajutekosajutobukex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608236047690b---32345065575.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b141e97046---mufusaxu.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d57b0a246---47216677528.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/25361032219.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a86354762---11147552728.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/sikijejakavifadutuleni.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/8c14adef3697ff187eb93edd33b8f2ca/perugavenigobozob.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/68281177387.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/bajavidomutewed.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160955734ac807---32564812840.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2fba00475---kapezusamugut.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/62917205215.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f924669b79---69511179700.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608129880da1a---vogolomanexipisepadevonu.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_off0000f0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BD 11496 bytes
SHA-256: 2ca1b735c9f4761c932135efd53cf6baf18569a4484d2b672f8a9efc788e6e03
font_02_sfnt_off00012374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12374 17720 bytes
SHA-256: 277124a36a716d703666c7b82983f3c0113b0d1235a19494bb85ee23065b0033

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