Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e6e6ffbad33aa2…

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 02:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 06c12a1ac3d64b56e7a2cec24f0afc79 SHA-1: d32786caf9fff5fc4afc0189ac3b9a4af26a47d8 SHA-256: c3e6e6ffbad33aa23eba713fadb55f42bea85e85a743dc342e507d45651c0dc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm hosted on compromised WordPress sites. The presence of multiple external URIs, many pointing to potentially compromised CMS upload directories, suggests a phishing or malware distribution attempt. Although no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to redirect users to harmful content.

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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f74de105fee---80405302327.pdf In PDF document text
    • http://www.sauminandy.com/fckimages/file/31138726387.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/98416261907.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/fuginizerekofexebozisudeb.pdfIn PDF document text
    • http://azizolace.cz/images/file/30434063378.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/1474373109.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160fc79835f9e9---rumew.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b53cc60c072---28034683329.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d039822bc900b8b2edb2be2371dbfcec/1262782445.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/61420067123.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/98778028179.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a41ceb567e8---lubulegunidikozi.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/62007573196.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/19076352756.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/35195606083.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161314a01cf46c---pujumilifidunapuxuf.pdfIn PDF document text
    • https://rajakedua.com/contents/files/47463115935.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/87171436859.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/0df676a31dd827cff22383d4af373b87/jowuzarepomijasut.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/6ad8df3153a7e2a9eba524ab5854b80f/3851125059.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/89027164446.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608846ef3242b---72639923605.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/semavavironidazo.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/90225543914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=drive+pink+book+pdfPDF 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_off0000bbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCC 15296 bytes
SHA-256: ee420bd3ae396397f84f2b8ca7b5447b5eb38b5cecd8d95f0bd9fb4c6b7c633c
font_01_sfnt_off0000e280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE280 10316 bytes
SHA-256: d1a6a0b11aa967017da6ba32e506f5bc7719c9caf499ad2694fc7767135aa3c9
font_02_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1