Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9d5982b85506d6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 02:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4bb36c59042aa3fa51ce91ec4d3979e3 SHA-1: e6f7447694c355bf7e264163d6e517e81fb3dade SHA-256: 0f9d5982b85506d60760d9fef116b71e7861c9d08e68a57c4ffe182cdad566a6
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://doer-sh.com/Uploadfiles/files/dozegapidujikax.pdf In PDF document text
    • http://deurenhanger.nl/userfiles/file/31747283642.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/15172840464.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d41264be4da7e18122581e63fa47610f/fobarebipilegemivar.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/40761288421.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf02e704f---38607432318.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160eca847a6df4---51447137344.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/lutev.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/fegapejezonuduna.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/95615980529.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/jitorijugusegapapug.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160cce3a6d6aab---kudexudasapekozifeguge.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/72904456821.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/modinidi.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/4c3ffdd4b7cc78d2fcdf106325c27785/62036530548.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/pitimikokoke.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/saxapebafikodiferemedu.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/6380783732.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608e793d5de88---pezabuduzosevizudufub.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ddb6e568e0c62c3baf34c529786020bc/13698023910.pdfIn PDF document text
    • http://bakoca.hu/files/file/towim.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0ff8b7981---1405071004.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/9314934672.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800757bb627---zesuse.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280057585265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mrc+scale+copd+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_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 17844 bytes
SHA-256: c1c4a68c6c45888e9221a1f73ba93f97fed1a935018a1f22898e3df176693cb9
font_01_sfnt_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 10312 bytes
SHA-256: 1108effc17655f2a3903f28660c6ff072d4823f788ea8b881eb482c196968f66
font_02_sfnt_off00012513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1