Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e06cc91f92743f1…

MALICIOUS

PDF

88.3 KB Created: 2021-07-31 12:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3aea3c903206ed0b0212e5fb9b3fa296 SHA-1: cdee67e681f3051dd313ea409e4cef4596ad5702 SHA-256: 3e06cc91f92743f1f2ea5c1632f033f8bcca0ee9980a8dce7dcc37addda4db16
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is part of a link farm designed to host malicious files, with several URLs pointing to compromised WordPress installations and disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggests the document's purpose is to trick users into downloading a password-protected payload, likely to evade security filters. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bobas24.pl/Upload/file/81607100331.pdf In PDF document text
    • http://abaj.cz/UserFiles/File/larimarir.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0cd899675---9644509587.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6bd32cd08---99043924236.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210722024540_g6hgoc.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/fidamifosenu.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/73419676262.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/duxivujibuxavozadilan.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/tawediwinuriroxavepexi.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/58004296959.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/scgj636reqtoiorohr5cjdorr0/43363943621.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/meladagalutitifa.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c2218534c7a862215625125d955a22a9/kifuxewogo.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865cea31e7c---67773301107.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/9l2bqb8qpd3uhncfhpsqjv6m5q/62963133701.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/25d7b06bfba88eec3d88b5840c030c66/wolotixodolubebujeni.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/57453510615.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/23340468771.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1859ac5770e0f4cd7428c2ab93b2750f/57661314134.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/16540418253.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2debadbe6---67854416112.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/gipupaboduzebelar.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082cd7519b0b---43578645932.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/86633967105.pdfIn PDF document text
    • http://maidichike.com/upload/files/16748148553.pdfIn PDF document text
    • http://artside.org/data/temp/file/bivurasubulimabali.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/90831384131.pdfIn PDF document text
    • https://webmenuplus.com/images/file/tokuxokagadidopilarabeno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=baixar+musica+do+youtube+com+mais+de+2+horasPDF 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_off0000f04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04C 18844 bytes
SHA-256: 722be865cbb9bd9db7a422600f15f70975244e11440703a68efe6b09d1f9f924
font_01_sfnt_off00011e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13662 11112 bytes
SHA-256: 16a2a9d8de28a07b3937d2ff936a9f9eb79cac8074fefd317a0535931e561ee1

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