Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12a3bf150705909…

MALICIOUS

PDF

80.1 KB Created: 2021-08-29 02:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5f115db1824e877b509b96bfc513f9c4 SHA-1: d91b634728793a9051043f39b93ebb951eb176c6 SHA-256: d12a3bf150705909ff4a310453cb0ac7f7cadf46b465db342717506b98f85e8d
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=caramelized+onions+and+peppers+for+fajitas PDF link annotation
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73a12bdca9---lexow.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/zikotibur.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/tibezolaropopibagex.pdfIn PDF document text
    • http://ibb-online.ru/f/file/45642976292.pdfIn PDF document text
    • http://linker-apps.com/files/96117324694.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/78575689153.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/836269433d9dea2f118547b7e1b8b667/lefisope.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/8475725845.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b73b457894---xipura.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/14143976599.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/27441938450.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/xikimapuli.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/j1705h4tm7r7m7m9ralenn5pd1/fidavirozu.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/ravugefogime.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/balenosira.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/gobizivuvefejejufejo.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/bodogeduxulizamujidomapa.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/dumitik.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/89669141634.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/14562519349.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/676cdbf3198bdc6987679ad00239af84/97932923974.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/revakepowowaja.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/junesikijurowado.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ae3c3521f52d55e622666b260bb40bf1/50280615257.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_off0000cfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEA 18948 bytes
SHA-256: ae4f3df72288422d1e047aeb8a8a1c96cdf386bd0ed7956b9c128831db1ccb66
font_01_sfnt_off00010172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 10880 bytes
SHA-256: fd4fef8ae7fe1f9bf6ac1efd889dfe45fa8990d09bd4182b0715e4649801d276
font_02_sfnt_off00011a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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