Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fc2b10ecbcd217…

MALICIOUS

PDF

96.1 KB Created: 2021-06-30 11:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7e1738381100f12caba01b2884af16b SHA-1: 86febc011080bb3135a24ed7a705eab9f7bc26d8 SHA-256: 78fc2b10ecbcd217f8edbf1d50468063309ae13fd5f1f6e11dfb748b01b91859
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://xn--e42bt3l.net/upfile/files/87190851906.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9742d2132f---76017189464.pdf
    • https://luyenthitoeic.info/userfiles/file/84375972620.pdf
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/3040549280.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d1832f2eef3bf2232290a40da2ad3741/41798905494.pdf
    • https://jdlpartnerss.com/userfiles/file/gewirej.pdf
    • https://facade-metal.ch/ckfinder/userfiles/files/5976918015.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/uehqpbv2p8oml9p9osm9vqvhj7/96466593660.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/dlqh559jmg36634rsu7usph1aj/nijefuju.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/746d983ddf27d5d6ecc4e033e54d8d97/simivokotomofoketutobiz.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/20b9484e8ecd263ae15390e8a1151f11/10221827687.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a250ad1fc52---divaxunu.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a415854331---pojifirivegorupubeg.pdf
    • https://liantoong.com/archive/upload/files/34305842370.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/nripe8ipu5qo0hfsmgl1t9rco2/87636874374.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/2a6ns6ukesf9auqrj0fblgcqgb/zazovoximafelosel.pdf
    • http://nitexprofi.cz/userfiles/file/dofubiw.pdf
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/4dd7f45e1666ff5bc43998460538bd5e/87195606842.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/87d693cf56e4b6154038a47db1b54fb4/vuduzadexojevipev.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c7c7ca3209d3806b3729c3f28d3da902/34561871483.pdf
    • http://vuatoyen.com/uploads/userfiles/file/27326865548.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/3e85fd2415a265810447fdcc298202ba/51104699678.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=private+equity+compensation+report+pdf
    • 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_off000112aa.bin
e8df86d54061e536d5f93686cb99534f3981862e28a04c228143d28c852f6008
pdf-font-stream PDF embedded font (sfnt) at offset 0x112AA 17756 bytes
font_01_sfnt_off0001413c.bin
6ef4a66a6e2085f3c50b9c7341e9ef996badc1a5b3110d12c19ed91bbed90017
pdf-font-stream PDF embedded font (sfnt) at offset 0x1413C 11164 bytes
font_02_sfnt_off00015b31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B31 16792 bytes