Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d93e28c11317b3a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-14 08:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 746a16b71cbd4b7590c710bacab6ef2a SHA-1: 10bb1b6d64932832a8a3531764df446368d3eaf7 SHA-256: 2d93e28c11317b3af85d02af17b709bce1fd9fc99459b5b3f4b6aaf32dbd7cc6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade security scanning. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://hoatuoi360.vn/uploads/files/nunumadakakatowurilopopi.pdf In PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af71923a6f---7530565844.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/xagupewox.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/3c3e1226288442ef11c9a25438794303/zexuzugubinepisewexu.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/31961915858.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/76536482217.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135b5ad4c5e7---wubokixapevutudisafi.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/68213224072.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///borilefisatev.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/4c13ced9b841641e603bc47fd0dd6000/8024039741.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/84093857973.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/66510004428.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/bofupabolon.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/13708156030.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fisugogobud.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/74306097601.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/bojofononepi.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/91190278891.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/50534401966.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/3989d76ac884f322daefa7672cb43297/jesulorevipapesitumimuw.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/34840672935.pdfIn PDF document text
    • https://negaratoto.com/contents/files/35621644023.pdfIn PDF document text
    • http://orthodoxnews.us/file/82307391243.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161400f4e8f151---89794645377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gta+san+andreas+apk+download+litePDF link annotation
    • 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_off0000d355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6C 10604 bytes
SHA-256: fbc22c6dd4e9b75acf555a9e01b2015800b895806aa5bda0b8db0509106a2659
font_02_sfnt_off000103d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D4 18896 bytes
SHA-256: 03619b2f1967f0b95f1d957ccdff703475bfa55c1c2ebe919a639790c961f880

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