Malicious PDF — malware analysis report

Static analysis result for SHA-256 257f4fab12713c33…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 05:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a163fadc71afad50aec8e02e861bcf20 SHA-1: 7b03945ce26a84ed19a2511a46822994e82e025a SHA-256: 257f4fab12713c3393932fec8c4f6d0a0d1bfd7fa23b09d4664acf627dca1724
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The presence of numerous links to compromised CMS upload directories and disposable hosting suggests a link farm designed to redirect users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly indicates the document's intent is to trick users into downloading a password-protected archive, likely to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://irlanc.ru/uplcv?utm_term=unsecure+pdf+file+adobe PDF link annotation
    • http://ipost.mn/ckfinder/userfiles/files/kadapapinoropuneze.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d47e6287758---56227209105.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/81120713734.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/3604a4dbc0ffe8fa289cde360599012a/fugikevoxebobe.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/jonilafododudar.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/6341399521.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3d6065bc49286070ffb7804abea1a029/56229052800.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/v9v6t4o3kdcmfv0hjhnqeuthog/25945518320.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/0d4nd65ig73o5ek8jt36pq8hag/4389865583.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612556e44b557---41086885063.pdfIn PDF document text
    • http://www.moyekolodin.com/files/41957957510.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/rurepadiseleli.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/9910e15ad522dee1a808e586cd5f59ff/gijunav.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/97773018885.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/609050914.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202172115852970.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/juwerowul.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/lupesuwexiziloj.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/33612397504.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/riduvopamatenevevuwiw.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608062e155230---22450117682.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/xabanaxasibiwaxek.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/33371572541.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/27350204835.pdfIn PDF document text
    • http://jkphotocon.org/data/userfiles/files/95864125227.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_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 17136 bytes
SHA-256: 3a5beec7d0e35bc8f5bc7e8cb9264d4ef3494fa6d03e0eacd43a48a024e4961a
font_01_sfnt_off000102b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B3 10760 bytes
SHA-256: 12652b82e24fbd82d2d42861dd1cc7b7df2170d384f8fc29a5bb2b1edb576be7
font_02_sfnt_off00011b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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