Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffffc10e1aa64ebb…

MALICIOUS

PDF

74.0 KB Created: 2021-08-29 07:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 114cab6cb7b3b0975d9ef9756cce947d SHA-1: d502a594b8ebf456919d614982070714879e6060 SHA-256: ffffc10e1aa64ebbc1412605ad4eb4e3814d20ec5fed866500020dfd592b1b75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, likely intended to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the structure suggests a lure to download further malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://medvor.ru/uplcv?utm_term=comparative+research+usually+involves+studying PDF link annotation
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/5d006ce9b03c7b0004c73647ca8fe774/suxudi.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b40442d18b2---dikamudutokuli.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160affb80657ac---23668580532.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/80957493299.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7fb909a78---78863830265.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/lubokubadusos.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/vijagaxosugekerowe.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a38be111b5d---dexedakonape.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/padivatanabevejumijaf.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c033e053961bc144f79ba9a3cafc470f/bumimaduzozawasati.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/nigetusodiwivowosupezine.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/lajevafesawarifozubagu.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/wusodivizupuvov.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/gatetamujosagokixufuse.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/51106793332.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3e87bc362f6f06184954bd931b8e7989/78465381526.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210718_EF37917537606454.pdfIn PDF document text
    • http://ellev.fr/upload/files/wiladamarikudozetilitoro.pdfIn PDF document text
    • https://mojer.bg/files/98455963545.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a44a4c1cedc3591ebf7d5fbddd0d7ec9/98661789423.pdfIn PDF document text
    • http://lyshiying.com/d/files/gezedumez.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2c7f82114---36552969789.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/gafjd530g85ktun8g8e4e7sqo2/58781827388.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_off0000bef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70C 11272 bytes
SHA-256: cd156ac992444d3c6c023f76222264c732693a95c35ef7a4f56820da93600b05
font_02_sfnt_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 15768 bytes
SHA-256: 884d9ed5ab8f319cf016d2c0afa72a24ca5110ce9ecaf8c9e34ddb506e56340b

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