Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e5869736d23735…

MALICIOUS

PDF

87.6 KB Created: 2021-07-14 09:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 88f0186ac8b187f527160b85bb4dbedf SHA-1: 7f9356c0060215973f6e34e97545dc6d68da88d1 SHA-256: 20e5869736d23735ec1fda4015ec94d890a0424c413236c3fc47887d008b0ed2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised CMS upload directories or disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this as malicious, specifically a phishing trojan. The presence of multiple unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://agataklimowska.pl/userfiles/file/kupulezi.pdf In PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89cd2be341---ditimor.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/susimolikopaduresapemawib.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/12743072904.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/d9ccd73f9da23dec35bf8d8beb3ed34d/85476069766.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a46e38b1b9bf2903a61bd1680e5bb173/94624700147.pdfIn PDF document text
    • https://advik.net/userfiles/file/tarisisutanebaz.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/d93124a3c549714e817550de9d86f31f/5698850597.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa7fdcd78d---5692054381.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210623234800149.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/giduxanutuvuwawower.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160946bef93b0f---jarubovinanime.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/bjg5a8af9vg6u1thqt3jne85j2/sogexuwonavanapenimaredim.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c1ca5f1f4834529ab0d5f077b9094063/10003222490.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1a0e2f470---mulovukujivomosenovigi.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/7fb12457f8a71983e1b50ca72a0da502/nonekosanilapomo.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/4d8gndmf319pfp59eas7fi43s0/15727532924.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/8da870d0269625cc6a3eb32f80e296fb/61892459940.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/gegalijovuzivakoka.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1625763463.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/sibudisimikixage.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eef6b72bde---walogipasamogujo.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/toniziwiwalo.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9140b78506---83122650651.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/3000691775.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/sutefusupalofakejavomiren.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+edit+scan+pdf+file+online+freePDF 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_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 17400 bytes
SHA-256: 7256c123a510da3df84b67c98628d816169e29ad075dbc9db84ab6404d356018
font_02_sfnt_off0001382a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382A 10688 bytes
SHA-256: 1c56f8208a23cd65d5756a6738ea15118ce06fc582f90229265c4f4927f4b37e