Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5a9dcc1b6a6a90…

MALICIOUS

PDF

123.2 KB Created: 2021-07-01 09:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 57692aaa5559d9505b17a761e49f292b SHA-1: 25cababbf51bc3d9206275cf57cf8dcaaf26bb6c SHA-256: 4b5a9dcc1b6a6a90dbbb7582afeec803ac916e7a98bd1b08d664d826ad8e8169
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf5ed99af---96449416539.pdf, are likely part of this redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95931b2ca---76622004773.pdf In PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097bb588b81b---fibagajapatole.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15994efa6---55226914093.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210525075523074.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607328cb94e2d---pixaradiluzezikebat.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/nepoxazobasudatewaxinore.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2666e9085---31825940107.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/830139f4eef967c92f90b8c691783584/85623847261.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/010719631eef8941677d18ab87eaa07d/komev.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/fatatemariwi.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5be664a8d6---figugakumapufik.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/wekezima.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/mesulekivamapezezubizap.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/0be55077668e2a38bbd2ae7c0cdc65e7/19694034640.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/3619865477.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/fbad2ca90e38bd36b675e3f5bd31074f/62655523857.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/0nsb0tdjaigkbmt3o8eni7ntus/99592691405.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/lurofozo.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9859e09fa9---tajan.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/b93639839ad5eafc6779c971462a6e27/doxejagexuruvarazaj.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbabab50bc---90688354943.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf5ed99af---96449416539.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072d531eb47d---65586176191.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/kegexafazudawegubu.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/3b269d12892a14a50d1fa4c0366569ee/wozataderaduni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+magician+jungian+archetypePDF 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_off00017f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F6B 17552 bytes
SHA-256: fa991ff24b72b0d4a3da4bd172c6b04f8d47434a7b87f27741a2517964a2707a
font_01_sfnt_off0001ad2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD2C 10792 bytes
SHA-256: 04626686e17ecf0aea6e3eee370839df3c5c8ab943443d480d0db682f04ce27e
font_02_sfnt_off0001c5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1