Malicious PDF — malware analysis report

Static analysis result for SHA-256 0852abfdc657a1c7…

MALICIOUS

PDF

76.3 KB Created: 2021-09-15 14:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d41aa6a7a04e92224249a024de6ffecf SHA-1: 40488b8e0e7d6eb546387579ddc17c7198de4d7f SHA-256: 0852abfdc657a1c7150a495c0b81d67ca7f4fe9bbec4a33ce2864caae51477be
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to external sites for malicious purposes, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=minecraft+apk+download+full+version PDF link annotation
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/1885902174.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/44424675365.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f951adf64---mamitatuwufekefodaloguk.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/95084221920.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/kokuxifo.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/pukulumudebilulip.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/50060061054.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210910012510.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/sukajugedudipajotudu.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/89403860623.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/waredimutefolulef.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/34d310457c5bd682116198c4a59282dd/duxudavaxelalozepawox.pdfIn PDF document text
    • http://beiks.info/public/file/73554092655.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/xamezakunugotanewame.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130effc419e8---49110961650.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/eb0dbeacdb1d0890f0490590894a1b83/ralowolofo.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9c6cd48674b7cf27f04a892ad256911d/kutomidevukuxatir.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/280999a9963c16fd1a484898123c89ba/lagasilepezitowiniwowutu.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c29e2d5e5---mefepidone.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/4407673990.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/lobepoted.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/58822125096.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/17708829360.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81883304136.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_off0000c5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 16872 bytes
SHA-256: 976974423120a1033712124ff5f0483d318739b0c7a756fbfc170a304457e6c1
font_02_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 10952 bytes
SHA-256: 4770c3bdb6e5a4d6bfcfc17a12f0c93beec319c88a9a0f34cb9817152e3fba64

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