Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99fe58afbc551d6…

MALICIOUS

PDF

76.0 KB Created: 2021-08-29 23:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e7f9cd499d08a0ea6e057a5fd251fabf SHA-1: fdac6b46e5ee41ab72c82d4015f5d995abcbf608 SHA-256: b99fe58afbc551d6663251411954eb12ae4638282303b01e19cc9d00a2f6fabb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm hosted on compromised websites. The presence of multiple external URIs, including one pointing to a compromised WordPress upload directory, suggests an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/803fe533be6f77dc78f3db9158b8dc5d/xokaz.pdf In PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/42015176474.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/s554fqb091e1jfhn08l470ps9q/98969299762.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/27724083108.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/sakekolosawelugazenaja.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737425b905b---77772120706.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65d4a81117---88980325665.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/63925188471b9ca3b0dbbc967a9aef07/faparuxofaburaz.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/5275769878.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/3fc5fu4eqpqlu5a00kral72l88/8404511110.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/63804429606.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/cnc0t78c8omfau4fm9v6a77qit/wefexifavojapeg.pdfIn PDF document text
    • http://ruresept.ru/files/file/zukodugu.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/tuguxixajul.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/wovireli.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082f0531e28a---lovezaruza.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/wadawowu.pdfIn PDF document text
    • http://ikoi-es.club/yamituki-n/uploads/files/tuzorizifakenujovabuvete.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/44449781813.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607441b9a3f0b---mirusemetuzofuw.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f269e32957---govozalugu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093d37e70fdd---31823025173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=symon+dinners+cooking+outPDF 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_off0000c58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58F 10884 bytes
SHA-256: 4fe4a1a756e2e3fd6239d21b8ccc1970a326615fe699bab8f6ea46d6aa66d094
font_01_sfnt_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 16720 bytes
SHA-256: 1d77a8bac36c0b4e662860a4b370e35f57e07083f637b803ab6b22af3981ec7f

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