Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4f8328e75a454b…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 18:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ae1a8e67973fc7af7daaaa7372a4c0c8 SHA-1: 5069b1fb21da0a4265e65ee1fc92e723657e37bc SHA-256: 0b4f8328e75a454bc8e141efc9d3254ef037b3fbb6e2b99db0bfc6eefdd7f17a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/divenulewetojitexigib.pdf In PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/gijok.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7cdcf93f362decb1162fc11835157abe/lukijusolixigudaruw.pdfIn PDF document text
    • http://entiambalaj.com/upload/file/mowenaruxefudomi.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaf51b5c83---78508773259.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/53206049584.pdfIn PDF document text
    • https://tonitomov.com/picture/file/73182248248.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/moginutinop.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/jisigilarotenizem.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/vpastmqjr9t1mrih3khaei08pf/84470053039.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1610da33cc8bf9---21568670468.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f54e51011---mojifubogabutirefesop.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/58591234067.pdfIn PDF document text
    • https://avenue102.com/uploads/file/wajunafepap.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/luzaporokelone.pdfIn PDF document text
    • http://ewtch.com/upload/files/redipizukikila.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/xijutazemikeborejup.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/jikazoxigujegabenegisiv.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/a28545d9730a8f3628aff119de41ac73/jivigamatigemikupa.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/j6pp0lb70ijua524l1gerj7dr2/74050771582.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/840962585.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/3grabjmusg40gqdl5ufjbdempb/temovudorotaxegabo.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/91895645463.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/goponoropod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=compartment+models+in+biopharmaceutics+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_off0000cd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD79 11156 bytes
SHA-256: 467d760d1629aae639f5a9b4508db7f15266fc0d81935498004240ede6da938b
font_01_sfnt_off0000e71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 17924 bytes
SHA-256: 695fb0cf03851da20334993dc220127bd47690c9aef048c72e3d79eeb7035016
font_02_sfnt_off0001158f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1