Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6065402b533ab3…

MALICIOUS

PDF

117.2 KB Created: 2021-08-07 23:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: de34d1c10c85084aff92e77297fb2777 SHA-1: d9889de0b70add1fc66fe01a15bfd65c4bf89d85 SHA-256: 3d6065402b533ab3691f5ded076699e17e045468c56bf9d2f19e5b57e7993e78
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or further stages of an attack. The presence of link farm heuristics and compromised CMS upload links suggests a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d47019b7cdb---41701071209.pdf In PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/97ed4d11fb58c9e36c8fcb96b4a20d77/42277136027.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafb019234---3421978527.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8543fab966---dofifepowefoduberumoxew.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/buwojelebebujowobepid.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/69376591955.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/16359561388.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/92080259964.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b47b77c74---83168793417.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/87729018694.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/rajidirapopalipulek.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/40253827827.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16096f96e5cc63---25073170867.pdfIn PDF document text
    • https://samowar.me/userfiles/files/vabasaforazim.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/12243176132.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/vudidakupel.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/54952588731.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/77044eb83869afcbbbc31134cbd1d1f3/sipoxim.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d49a4b6bf6---68313613654.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/85387481154.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac14d6d955---60317306990.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/lf64qus1imghma3fjmo6avrtn3/29767840496.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/lenabibekuvezidujig.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0c8ae8c5f---96589167853.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/86616270383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=des+fiches+p%C3%A9dagogiques+fran%C3%A7ais+primaire+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14798 21056 bytes
SHA-256: ecce807c1a8365b4dd736ea967b32266217a684cfaa91773f145d7f81f6c37c0
font_01_sfnt_off00017c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19430 16104 bytes
SHA-256: 497bafadc9328a0982935a90805f2e8e80fa02dcce24a94830fc4ce7890996b9
font_03_sfnt_off0001a973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A973 11520 bytes
SHA-256: f7cfbb8d7610031312b854dd6a2da47929205673130e5cce88fee0196ed323e9