Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e54a785985e50b…

MALICIOUS

PDF

95.2 KB Created: 2021-07-19 09:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65e3707c55913f333f97c1ff0d0dea99 SHA-1: 22c2b5c1bf4ab7570e46bb60c77d508c77c5a847 SHA-256: c4e54a785985e50b0dcfe57a232bc5f8114616373806b9b00a776fc17065491b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL distribution suggest it's part of a campaign to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bertoniamministrazione.it/bertoni/public/file/70565991781.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1127153be---72587762744.pdf
    • http://btc-ltd.com/upload/file/pilidinubuvevekitatoxa.pdf
    • https://ahreco.com/uploads/news_file/lujelakefekikagibejinu.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/ea520d6bcb489b50128b114d6c3c5193/gulamogolesixakul.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ro9873ct11gojeoe5rtmptj2t8/79193638703.pdf
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/dukedi.pdf
    • https://idd.no/ckfinder/userfiles/files/13716298351.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/df846e93c6f8994ee43c0ddbb367c92c/betowoxoladofopisunadesu.pdf
    • https://triosms.com/userfiles/file/tunanigomuxegu.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9700dacc88df0485c3e0d56265e5996a/benexufonulenulawupivik.pdf
    • http://foodchemsino.com/d/files/suramal.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a36ffe487d0---37333411119.pdf
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/70612661241.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160915c31351f9---72228451661.pdf
    • http://jarosi.hu/files/file/55475033823.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0478a7945---malofifixug.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/25276164897.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f33a624ebdfa9a60679bd6cb1e2a08f0/worekuvad.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700814b2b26---zasoli.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/0f8vjfotqcd8cop77ishtqc0pm/44547797678.pdf
    • http://idroter.org/userfiles/files/makiditugapuzasegewiber.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2894f3483c---91080934329.pdf
    • http://physiotherapy-warwickshire.com/user_file/file/xoropuliwiturodiriz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+exchange+sodastream+co2+at+target
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F76 16792 bytes
font_01_sfnt_off00012788.bin
6ad9e694930c96aee275629647efcd6d1a20193be50c5d9c4fad29b22ddd94d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12788 17128 bytes
font_02_sfnt_off00015478.bin
597058141bfc5f272677fba4f71ebf3ec435ddd27200a1a26077480cb64213f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x15478 10980 bytes