Malicious PDF — malware analysis report

Static analysis result for SHA-256 dddf3efadfa6d33f…

MALICIOUS

PDF

86.7 KB Created: 2021-09-03 00:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea769e180d6f269d4483173aed82a3d9 SHA-1: b8236fa74dead4717d4f13f1b548ff293e3c6fdc SHA-256: dddf3efadfa6d33f737adbc6319404a143636ba9fc4618d418b5a6740b06452b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://huntic.ru/uplcv?utm_term=cardiology+an+illustrated+textbook+pdf PDF link annotation
    • https://onhimalayas.com/ckfinder/userfiles/files/6575406382.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20218211848523381.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9182c74302---zazuzifa.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/d4debfb91444d271cf463ed60055727c/rapikowegiragekagafa.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611073d25497a---15764347287.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/34598132703.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/funuguxipimaf.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/35901286696.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/74223152513.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f4fbe9fcd---96196072092.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/34150822073.pdfIn PDF document text
    • http://e-sportis.com/images/upload/pawagabuvaj.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/pozizamunivopujuditas.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/35268608073.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76954974801.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/65307648518.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/89240163984.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/5i8q6oi7l9d9s2fqmte1cr05b6/mosuzokikaxosujupativik.pdfIn PDF document text
    • http://expresskaliski.info/file/4965239123.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075f771853b5---nibosikutoxefeva.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/lusisawaxufopufixake.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080c2e81524f---87669628350.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/42636258742.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/21826820536.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/vigivetag.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 18800 bytes
SHA-256: 50e0f47214fd6a0c995d17b1a680d7332da63a2292c60746f717cec0a196ced7
font_01_sfnt_off00011114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001292b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292B 11252 bytes
SHA-256: f0a0d25c6342e58293159c64848ede9871c55143aadc29f56aad2baf9ddd2e10
font_03_sfnt_off0001434a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434A 1908 bytes
SHA-256: e1b34b56f766b52dd7f6f1608e19e75f17ced996a683346d6fdfd66d0a8877c1

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