Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e53b367b9798e5…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 22:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ba7f19bc7fff8cda4a67f1af6c6a617 SHA-1: c47f7b1649accebbd24e9c327f3da8ae22503169 SHA-256: 67e53b367b9798e595c77b7dd6044bf339c05d06ff0b8c9908e62ff6ed6cc946
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the presence of a link farm, with many URLs pointing to PDF files hosted on various domains, some of which appear to be compromised CMS upload directories. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nikoljski.com/ckfinder/userfiles/files/katanuzobujopowobe.pdf In PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/38904488866.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/42164022782.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/d0f01d0f2e75d93e2d5ee5b739571aff/69617323544.pdfIn PDF document text
    • http://winso.tw/userfiles/file/92050650582.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/97346287614.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/xejixewixidusi.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/49769898074.pdfIn PDF document text
    • http://ihdbd.org/upload/files/12567632675.pdfIn PDF document text
    • http://balalajka.nu/media/lopunirezexebutebajikuz.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/zodiwomupuwogete.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5db434db---30323743152.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/89800294646.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/14302922998.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/kdg2gcd1fuh4jqe65umic0lc7k/lusemomavotexozajofonotu.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/matarobugudikiki.pdfIn PDF document text
    • http://www.bash.cl/media/file/64983340183.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/wilegusaragidaxomalepuz.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/62756804146.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/79900594439.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/setibefubapojofelotem.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/mipimugojureminitit.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/munevi.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/farukirabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=thoptv+app+apk+free+downloadPDF 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_off0000dd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 16480 bytes
SHA-256: 13e058cc97612d3795a0e32f3b3c23457a16755bd19c27fa42670bd4baed3315
font_02_sfnt_off00011f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F97 10540 bytes
SHA-256: 864652e26b521f81cd2b87a126290695910584b074a50c58994c7f4e2f2779ef