Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad91076df0f44897…

MALICIOUS

PDF

108.1 KB Created: 2021-07-18 12:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1856f107fbb45f49de3cf0e61cd36096 SHA-1: 54e1828e526a4c46082552289ea3bb0a1d8ce6bb SHA-256: ad91076df0f448973af5ad9151e2bd1dccf8e6009eda9b5af19844949a1c786c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://radio-aurea.eu/files/file/botidemininofinasini.pdf In PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/49bp7p7fcg4ksui0j73oouipbu/69436596591.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/55490f3a31a937943334d06fa16197d4/lubiwunujitinaxisep.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/kibodimunitekikatusejawil.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/kozowipafojopowamupetisom.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/64251005f4d215b25637062a6a3d8383/lovosaz.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bc21f3864---83716743028.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/74231dfdabe17caf2a25e14119e17198/4847691975.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b58b2aab05fda7909f5bbcbc33931bb4/xonorenejotunite.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/sasomo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae810c07b5e---vewizuviwanunemipu.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/fupododemagolujemig.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/865715248618f09bb21bb9924a976860/45652115429.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210623_180307.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084f51276013---32126461334.pdfIn PDF document text
    • https://preciseenergygroup.com/media/78855247938.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ea6d05e0ccc7e7ab4eda8db8b1167115/wasivetevofatibu.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/wikotuvi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2llahqck2q72n8pupekbk4t6re/61586831037.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/dagotidusazewusapezas.pdfIn PDF document text
    • http://jkohut.pl/file/vorewudajepegesotolab.pdfIn PDF document text
    • http://prmakeup.com/Image/files/58660360499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=one+fifth+of+earth%27s+total+freshwater+supply+is+inPDF 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_off000142c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C8 10812 bytes
SHA-256: 3f0b24ea401b6fe41642b16fb6c933e2bdd1a5f8d08a306b54c7c6a0974f51e2
font_01_sfnt_off00015bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000173e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173E8 18108 bytes
SHA-256: 9edfe38b53d6a2c52e728f9c71ec7bf29847c4cc90bd0769b9c825aea7f3b727