Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f8ac73e641c13b…

MALICIOUS

PDF

78.7 KB Created: 2021-09-14 19:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3653c6cdbf30159b274c7ee0174a0fa8 SHA-1: 70634001de6c576f669fba33d3731367812d2cbf SHA-256: d3f8ac73e641c13bddb46dab83b00b75ee92328a181ff3de69430e44147b0c48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites or disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely for further payload delivery or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=slender+man+android PDF link annotation
    • https://9ja-bet.com/userfiles/file/76833198757.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140bbae7bed4---41760892328.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/92274362647.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/pujunub.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/kalosi.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16135aaa75f298---50142542616.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/tupiporakepi.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mibufakinewenoluvu.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/51244823162.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161308684874e1---kizevig.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109112304553823.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/95006637398.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/xevabawowol.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/refijudilasuvumiduratu.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/zipopadekizavava.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613a526825000---zoxafubogatefivu.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/ramew.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/luvasiwu.pdfIn PDF document text
    • https://mcsfood.com/images/file/befelozarudozuxewubogibag.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b254e560---90048736180.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/nufonozimidikaketim.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/60820331174.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/80653449905.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/bojugizumofotixaxutamusaz.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_off0000caaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAA 19764 bytes
SHA-256: 6180dc6bb3002524c652af83d724ee37392fd36325b6b36b1d2263de29801f13
font_01_sfnt_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D4 10220 bytes
SHA-256: 213865ffee8b99825c9358020fe4595d2b82d682d2d2caf65605b8d3acbc02c3

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