Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4db7cfda386d993…

MALICIOUS

PDF

112.4 KB Created: 2021-08-14 15:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0ad8f167b113087878ee857cc4a638fb SHA-1: bee11c7b2a5b1eb72c4f573c581d865e1cb76ff8 SHA-256: f4db7cfda386d9934bad36175e7ac988f29f41512699c9281f9cccf690166337
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as redirects to phishing sites or malware download pages, aligning with the T1566.001 (Spearphishing Attachment) technique. No scripts were extracted, but the structure strongly suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/mlrc4fht78u3eeg84urda8dgh6/93664565428.pdf In PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/46430867998.pdfIn PDF document text
    • http://c-amc.com/upload/files/67790932780.pdfIn PDF document text
    • http://mega.kz/media/upload/files/rijaxutakuduluju.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/85125020327.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/67537e4bf5224d2ba4ee91223071c6e7/83582151621.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/rumajilojexanebigaga.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edaaaba02ea---21493813367.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/a7e701cd7dca5eee02210495f2024723/wotatazajutasigokupino.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/41466702399.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/sonewajof.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97569b55b1---59427636902.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/92482499673.pdfIn PDF document text
    • https://mytopics.it/uploads/file/17901879987.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/daxivokezagafekojo.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/238f98a133eede9e2ae14f77c32b1eac/niwowu.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/45923794245.pdfIn PDF document text
    • https://actor-conseil.com/files/file/24855448042.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/garamuxevezavalumolemudo.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/11823578194.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/u3l5pija51j207ipkej0s1cfp7/bobapobed.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/gerotijimapikatekino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+the+number+23+mean+biblicallyPDF 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_off00013dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEE 16364 bytes
SHA-256: cfe0d689e15f81952f7a9d794134c99aa82f3e9c70c46c12a2205cf5f813865d
font_01_sfnt_off0001543c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1543C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C53 10848 bytes
SHA-256: f0ceb861f195c4935b669a48d3b266394b757723809119c63ae69f539d92c3ef
font_03_sfnt_off00018539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18539 17400 bytes
SHA-256: 8f5c9110d867e4ba8c7c865dfa7c8bbdc75c26ba2853ce5751e7e523f4177555

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