Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcbfa05e50b0174…

MALICIOUS

PDF

97.7 KB Created: 2021-08-11 10:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca34f375d8d12979126fd01da7cb7426 SHA-1: a022fcc673170186c38c6655f03297bac3fc0e1f SHA-256: ffcbfa05e50b01741476009ab2024244ec528ff0f0d20480b65ea400f33df4bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing attack, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16111889987f60---1088448140.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/tuzojuwovivejejolali.pdf
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/34702030528.pdf
    • https://detmers-kontejner.hr/files/raluremelekebuzuzadejutit.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c38fd06bb36---negejeledowukugutodexa.pdf
    • http://kramor.bg/userfiles/file/22126343191.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f1598353a40---9700788885.pdf
    • https://ludifrance.fr/userfiles/file/8427683078.pdf
    • http://afghansolar.com/userfiles/file/bijemurejidulowagusegid.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/04hdhrjct0mv16ptptgrj474r1/771378733.pdf
    • http://moderncarrent.com/user_img/files/vugafusuwalobulo.pdf
    • http://gemwishrs.com/ckfinder/stones/files/3202582979.pdf
    • http://lyjclinic.com/ckupload/files/saxuramuzezokir.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/a0b58b6454ba42e885e4ca81dca4d538/55940342683.pdf
    • http://afghansolar.com/userfiles/file/48545472255.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/feb24251f1bf0dd153ce5162f78dc3e9/50315735168.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cdda0d04ccb---91683756274.pdf
    • https://tsolisp.com/files/file/tizonujujas.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608099b43f448---44921157267.pdf
    • https://summit-christian-academy.org/scauserfiles/files/lanumawopelikisi.pdf
    • http://thegroverestaurantnj.com/userfiles/files/23148315458.pdf
    • http://namlinhchisapa.com/userfiles/image/file/24384778141.pdf
    • https://burgaseguros.com/userfiles/file/17685525715.pdf
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/juzuxamexitu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=smash+bros+brawl+official+tier+list
    • 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_off000119a2.bin
9f39c07a3b115ea2bd8bfa8c3d9bdae6fba1d88a3263fba764ccb4bba3048506
pdf-font-stream PDF embedded font (sfnt) at offset 0x119A2 10796 bytes
font_01_sfnt_off0001328f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1328F 16792 bytes
font_02_sfnt_off00014aa1.bin
14bf411bc9cc91e862f11789e698f07733095c7d1f0907cc261097fb1454de34
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA1 17764 bytes