Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de6fc960c3aa128…

MALICIOUS

PDF

79.8 KB Created: 2021-09-04 08:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8cc2eb4d4817d555c86a319ba1138ef8 SHA-1: 13c261850e734574bfd04243e396f278296d2f40 SHA-256: 4de6fc960c3aa12813943724a460f68cc0dc138c5f09566298fee2db9bb88dbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/bf6bd9ad654d29294075e013c024ab8f/35766286542.pdf In PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/92335d3f280096499dadf60894c2e635/mizekesikaz.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/a97afa423fe644d135161475b843a2e1/56955541420.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/busudupuxe.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609877518d2d8---bolif.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/c9027ef0ff89f5243a88cd74570339d3/gotagikupogonin.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/75126996420.pdfIn PDF document text
    • http://industrialdevices.in/uploads/riwifiziketamopebizawu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffc321856de---27417775649.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/88594737912.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/monotajokumufe.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/19889535956.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/zagiwojarabakejigixekog.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/1a4698824e6981df0b8574bf875a3a40/xomirumadexetukemu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ee837331e9b---78519680160.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/ganibejuledekebug.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/zeraxedixowukamonap.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108162033231108.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/kudaborisubotuzesivop.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/43371588870.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/gonawin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=case+study+of+a+child+pdf+downloadPDF 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_off0000d394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD394 17680 bytes
SHA-256: feb7edd84ecdf7145ea9adadb953d06412cab5e8d6d3261e5b163e7349cf6984
font_01_sfnt_off0001008f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A6 10948 bytes
SHA-256: 31a2169e46144a1b793ace8d67dc241f698d9581c6ca9ce46788f508be4a7e4a

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