Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3d2635ada9650c…

MALICIOUS

PDF

95.1 KB Created: 2021-07-20 21:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2f13541240ece445a72e8fc75faca9e SHA-1: 0051ada86e12ac5a484917666306ceb33f644d52 SHA-256: 4a3d2635ada9650c8cc7b45bbece95ead566202427ce9a2a82267586d52e6f31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • 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.
  • 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://grupahatak.pl/admin/_fck_files/file/xegamane.pdf In PDF document text
    • http://analogsys.com/uploaded/file/14250257460da9a8a8b2b5.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090ddccd92cc---80767690882.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/25259954855.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/jolumasitokupal.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/bedetafebamimexe.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609064be671be---14258609735.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/kasuzataxozubemetom.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34a2491865---wutidawezenim.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/5ca13fa6836a3b3b1d0b5ea13d91ab8f/matulixegugadubakefisowi.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/6pucj712t8lq59rh16k2ndo2j1/11397331429.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/2362e2d0eb9b36093cb6ec07e087ae3c/gugidugadavuxozexiton.pdfIn PDF document text
    • http://pronobile.de/catalog/file/74733194610.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/95051091449.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/80a58b187b8b1ae71655593b91e2f444/10285947520.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098e25702885---63777862398.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e16a00745e---bitabipofonusapezuz.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/7999c772ada726f32c0d007d811df8ea/nazaxapalovawibamiwag.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/90371496013.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/074a1d82104e10148a47617551f3e987/lufodiwemutibejojibu.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/gmmd3f68pcdkjnkc51ifndqp1j/84891769953.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/facc473a7c774e0daabf8877588c4d84/veworadez.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/96173110141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=plant+organ+responsible+for+sexual+reproductionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 16256 bytes
SHA-256: 0012b524c3ad3acf8ece7d40711be2dafc31c75842a94583eb33042a49f86623
font_01_sfnt_off00011ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC2 11140 bytes
SHA-256: fb756c9f840705c54ee06d0cfc3d948e2ed7e52e495927a882bfc12444acce94
font_02_sfnt_off0001387f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387F 18536 bytes
SHA-256: 0f602e95c909cf1b3df8a63b066439d5031428b290d709039de6c683f70060b3
font_03_sfnt_off0001566e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1566E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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