Malicious PDF — malware analysis report

Static analysis result for SHA-256 926845bc23ba72c4…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 15:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 48fb30c3be3791ef778487b2525f3371 SHA-1: 6b15fc7f9ffebe8423fe347c3dd62f1f443be544 SHA-256: 926845bc23ba72c4a7124f07402c36a8789cb5e9f6bfa310a3bec20af018044d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites. The presence of these links suggests an attempt to distribute further malicious content or conduct phishing attacks. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161369c6d3c37e---81200433313.pdf In PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/60170877985.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/62296689561.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/goforidalofujuvagezawa.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16144a24f9e23c---mavobogogak.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/marobabowufozagupez.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/sexamowejositeb.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210905_29E81CE0C8E60194.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c270a810c---83077827890.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/peduxukofupugasi.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/99197621156.pdfIn PDF document text
    • http://katela.net/userData/board/file/21215354517.pdfIn PDF document text
    • http://cutskytools.com/d/files/47448249610.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/49066867913.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/15056940867.pdfIn PDF document text
    • https://kopari.hu/files/file/ginepiwopotob.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/58775221327.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/xamiweluvijopiseva.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/54605253150.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/91367502547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=can+someone+hack+your+camera+on+your+phonePDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/76540277564.pdfIn PDF document text
    • 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_off0000dce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE9 18212 bytes
SHA-256: aff85db1a061e731deebbb576be51610e748092ffa8ed898a19a1ca5148c8e71
font_01_sfnt_off00010bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB6 10740 bytes
SHA-256: e5f662e93f5d683bd4e559bee8e2d6cfa9576314c59eb56c48a0d87c44d912e3
font_02_sfnt_off0001243e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1