Malicious PDF — malware analysis report

Static analysis result for SHA-256 38321c96bed8c69e…

MALICIOUS

PDF

101.2 KB Created: 2021-07-02 00:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2c563e5078d5f95a0c37c23e9a89ba3d SHA-1: 7c2d78cfd800f00b902b00d1c51df7b170b82a97 SHA-256: 38321c96bed8c69ef2722d68d3b0e63646afb13540e1997bf2f8c3dd1f7e0a85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of multiple distinct hosts and the use of WordPress upload directories indicate a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/7020039f74982244a142c33151cd0c98/mogaseteguxomavobu.pdf In PDF document text
    • https://premiersuli.hu/files/files/ronibifotag.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/legevoriwib.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/61356557795.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/33d47667c205529b408b2f30b017b8f4/xufovisafupogufe.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/8a361e9891bb99872ccd672330057665/13037273195.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/vazevikogevuwexomorix.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/xoxonevepimumekatulirate.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/tcethetj20bbpkvsbi9rrqnila/jojevodonizopi.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d31c035c4---nobovimuvodinebogagivag.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/f4cf80d579285efdab9091c286dad104/48784376678.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5aeafa7b7d---koruxanev.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2750c5b870---12105274550.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16093ae4d962f9---15693724936.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baba6867486---43139420381.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/rageku.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a343a439593---3982770988.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/42kolubv906p4fghses2i88g55/puduteru.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//mitojogumegesa.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e46b595e7---jetejavizatarelo.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/7b1aff5edce9aca03076297db8fcc715/pesitu.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/d68db86e9f44e279be8b1e4e1bc4888a/98145926575.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609769889d008.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210606120053.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/10ada9dd0e25f769f8555b022543d053/92973801018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=inbetweeners+quiz+questions+and+answersPDF 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_off00012a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A43 10676 bytes
SHA-256: 4e68bd8b53a9451dd6a04c4105d362b3b72d5223e113f3801b9447e026e2266d
font_01_sfnt_off000142be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD0 17028 bytes
SHA-256: 9081e4e494f169a10c9ac2a1dac92b024e708f25003eca305d6f0d1c0a6e761e