Malicious PDF — malware analysis report

Static analysis result for SHA-256 790a5151a687e297…

MALICIOUS

PDF

91.3 KB Created: 2021-08-13 17:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9924fc2a9e0cd254ab993b96aa1a9cd SHA-1: 9e2011540bba90f1e5a5c26b3ead5d982d28e954 SHA-256: 790a5151a687e297bef933e160282bec6304b72b6a8d239b4adbf4ad9917f662
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ho4e8dg5pi0geljmfvml2rndm1/kovukigurorofa.pdf In PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a6009b7d2---29649261249.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/61ab7ed49cdf540be5a8acc49ea502b5/tajiwevulemogofalo.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/fpva99jheud47ffdp3epjl3ju7/36440438246.pdfIn PDF document text
    • http://poorclarescork.ie/images/rejusovuluwodir.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160acf293c5f3e---kelolagano.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/41507350192.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/95789703684.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/nugajofexuva.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/dizokuwepivugosefuz.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab8e471914---75834838642.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/zanivaxirafedititar.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608610b8015b8---sazatoxu.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/risusexijoxo.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/xenusipot.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/zeziwezibi.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070461fde1e8---nebebofavodenodirufujuvut.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/firifagi.pdfIn PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/20517682687.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/juvepato.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/9a728b7fea52e048d6239122c8aa2bf5/legixorexesi.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/br0n7f7oj0mko1u00i9dl8thq0/folabazazorixino.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/60689684772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ample+guitar+vst+crack+redditPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/kowokekesajopivonu.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 1772 bytes
SHA-256: 9be22663f19fdd52e41ecc8def464d94bac37e1effbfacdbf6dc8b04d16dbc05
font_01_sfnt_off00010006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10006 10872 bytes
SHA-256: 13a9123691af2f85f6c0e1aed66f5456da3af4d1001b5e279f44c6dca7a0ba6b
font_02_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 17420 bytes
SHA-256: 14730e6d43ad1afb664f41bd73c32bbee43fc6fdbd87d81e6b37da823c165a4b
font_03_sfnt_off00014641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1