Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c29b8c4093224c…

MALICIOUS

PDF

94.2 KB Created: 2021-06-29 00:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 824ef6787cce2cf5cea7b6bf58354ce0 SHA-1: c9363c96518296dd35fa3c16f9282e6abfe011d5 SHA-256: 42c29b8c4093224c28408608dbeaf15896016132327a4e3ae9882663fdf66dbd
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The PDF structure itself does not contain executable content, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/2717251b65b5a2c7fe971b14e009b646/77719666454.pdf In PDF document text
    • http://aaykpn.com/uploads/editor/files/lunenumonowetamotafixoso.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/kediv.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/dozigodusigejenit.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/5634973710.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160723fbf8ff24---temujisuwefemamob.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/dd36d6a5cd6415cb1617171e46aab376/pivenos.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af8683c104a---62409291130.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f576db37800e9ffcb925c050ce458e56/mozatevedavobetovebe.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/05868df2bdb6149be81b35b89a479913/38045171511.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074139e1b5ee---29530991429.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/22641204323.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6ad29ec9a---62330349697.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083be43a6d46---zezetolezagevibemitux.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160868ad6d7a03---dukewegitunu.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/99990756041.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/50598149782.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b070ed64346---43378429485.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/vezeserutowulawazik.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/82183556656.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/jutasutexipimoj.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/bbf22fb82754cbc8a118739cb92c05d6/xubarifidejedejo.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d19fc6bab---69346758916.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/xejikovoselekazaporivow.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/27587916247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+many+relationships+in+dbmsPDF 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_off00010d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 10988 bytes
SHA-256: 06ab17eb2e1650731897969a6bfcf856c65352ec3bbde868ca3b9eb49a6b163a
font_01_sfnt_off00012667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12667 17472 bytes
SHA-256: ea085a6b6d490121c62d2ad1dfb253411ffe40b612e23a5b44cf233a9199e949
font_02_sfnt_off0001534e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1534E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1