Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecaab8a273ce22e4…

MALICIOUS

PDF

81.6 KB Created: 2021-08-02 08:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8524c18218ab9a8a58bffca95493235c SHA-1: 881072bab5cf6fb1ad53a3d2f49fe9d6627e545e SHA-256: ecaab8a273ce22e461fcfccf1132b77fc77a8c727618a9a91c10b53d608822bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or redirect them to malware. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dec39c4b702---zufibosiluzate.pdf In PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/nobewuzivatadokizav.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/metebixomose.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/40053407266.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/kiruwek.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/jolujapiwakosamubofe.pdfIn PDF document text
    • http://maidichike.com/upload/files/lefevenetul.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/melibufozafivozu.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/89068333226.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/vqhrp2ffe4ca3e1ho4h3uplsk6/76173842227.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/ae060c9273051b0f9a575e8ad5165657/labisubupolazuda.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00470526e0---40649080314.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/ladujazitifekij.pdfIn PDF document text
    • http://www.toptehnik.si/images/70006469069.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/qfgjmujulo97eslh8lq6u9b723/11811181187.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5626f8ea04e65f5263b5fc9305dc121/75678936929.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160846a21b6a4a---tukusorapofaxozonotuno.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff565da3f8---tenodifexokaxozato.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/2126076541.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/simiwazefuboduzafopakumos.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/79261554079.pdfIn PDF document text
    • https://birutelorasin.com/contents//files/80936161000.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/lugalubimibobefazutopanu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vetezinudibomiz.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607375c50d231---fozikata.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160708ef153b8a---52779361090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=libro+economia+4+eso+mc+graw-hill+pdfPDF 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_off0000d8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 17516 bytes
SHA-256: 08d72682754c981e409664933d8d5d5d335c43aa27c5df53e7e40c3ff3c05809
font_01_sfnt_off00010541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 11264 bytes
SHA-256: 353b956296f38c70ac182f031f36265e0a07f9e84fe440e0bfc83e21ecf8d6bd
font_02_sfnt_off00011f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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