Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2107ec57020c390…

MALICIOUS

PDF

78.9 KB Created: 2021-09-14 10:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64624b889ce718cd838c6ae33ad91b5d SHA-1: eb5b90b3edf66038921997822d676f8ec465002f SHA-256: b2107ec57020c3906523600fbab25c247749000adcc84e371752e47491632eac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm, with many external URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • 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://jills.reviewz.eu/app/webroot/files/userfiles/files/nadeladolaxawekinopad.pdf
    • https://prevodi-plovdiv.com/userfiles/file/49164199759.pdf
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/3813297135.pdf
    • http://herborgthailand.com/file_media/file_image/file/wiwasutapewis.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613066a961a15---jesila.pdf
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/67265205990.pdf
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/15387216569.pdf
    • http://yigang-lin.com/uploads/files/202109030033584103.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613214fe78d3c---68406343057.pdf
    • https://ratsimae.ee/media/contents/file/jezoterokanikulopemumigu.pdf
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/67843324295.pdf
    • http://barrybusiness-crm.com/ressource/devis-photo/files/25255397826.pdf
    • http://bolt.fo/public_html/userfiles/files/7132304831.pdf
    • http://verduciautodemolizioni.it/userfiles/file/75673995036.pdf
    • http://artpolyclinic.com/file/files/36662182632.pdf
    • http://casinodanmarkjackpot.dk/userfiles/file/74608739326.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3d6d32d6c---tetewujoni.pdf
    • http://irinabailey.com/upload/files/99480924467.pdf
    • https://netwindowvn.com/uploads/userfiles/file/19021680760.pdf
    • http://rockefellersgold.hu/editor_up/dovanunitum.pdf
    • http://unixsensor.com/uploads/files/202109080504449892.pdf
    • http://dayou.tw/uploadpic/files/202109012318328309.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b92f199824---36835325425.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=gurulilamrut+book+in+gujarati+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfd2.bin
9c82de461e7fb62f1ab93837ea3be1af81a7f242b946f0490271e9ce9c2f60a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD2 17584 bytes
font_01_sfnt_off0000fd26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 16792 bytes
font_02_sfnt_off0001153d.bin
a31fd4fe2cdb435e190b3a6d9568d4258f9aca20d29cc5f9a5c75d4094754caf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1153D 11040 bytes