Malicious PDF — malware analysis report

Static analysis result for SHA-256 deeba36ff21c93ac…

MALICIOUS

PDF

82.0 KB Created: 2021-06-30 23:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 45baf3de5547dd3c8b639837e44cd3db SHA-1: 953f33958e0905d66bd2b7e3d8718018176dda18 SHA-256: deeba36ff21c93ac8979cb1f5930c231fe5edd854e37966fdcbbbea0452ffa18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to compromised WordPress upload directories and other domains, likely to download further malicious content. The presence of embedded URLs and the 'SE_DOWNLOAD_BUTTON' heuristic suggest a lure-based attack pattern designed to trick users into initiating downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • 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://wastran.ru/uplcv?utm_term=black+book+of+english+vocabulary+pdf+2020+download PDF link annotation
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/95d6feecaf0c6b6a04cdfed0459c42b8/vosasuwikuserosuxigi.pdfIn PDF document text
    • https://recrut.com/files/files/kututopevowetutosof.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/xixusilizepamil.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/8ab999e1318d759752c7191bb69dad91/viwuwarefev.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a017e258e35---91015725018.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/97370062075.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/66324135639.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/wafobubedi.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/7562292671.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/mkting030hnjgva4aapd4j5tc3/zokezataral.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/rafewerupovimefuxavuj.pdfIn PDF document text
    • https://dineflon.com//files/vupidelubejobibav.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/77893535c3eeb8b10374ed9ca432b18e/74970609310.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608107bedd310---momasimuligose.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fed73b9b1c---21623123546.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/78210590136.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/fofemujagus.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19a18035bc---3410925595.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aca4fd0ff2c---taxowisinawuxur.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/53d077fa2a9b80bec6589d91668bad14/12472116065.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_off0000d865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD865 17928 bytes
SHA-256: 6386250bccaf27132ab93c464bd83b749527c23de94470acfaa5926e19524687
font_01_sfnt_off0001074d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F64 11692 bytes
SHA-256: bfaa6234cab6559ab1b83df2eb580f6122e582aa024ebd9ab97f1dff1cbc030c

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