Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4dc4cfa419f188…

MALICIOUS

PDF

85.2 KB Created: 2021-08-18 21:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8dfbb2106b7017897533a99c616fa71 SHA-1: 6b422fec59170950e21cea38706a05c10b7e2627 SHA-256: bb4dc4cfa419f18817176766223752d60f14f4725f0f9f69435e47269c04627c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://krisoc.ru/uplcv?utm_term=neuvaine+de+protection+spirituelle+et+de+lib%C3%A9ration+jean+pliya+pdf PDF link annotation
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/80832604996.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c773119bc6c0c7d23b5249ac3b4eaa2d/tanokopeniwasakufo.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/8glp5iobnu4t0874kdia5i8g88/felotanujevutewubewonufo.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/dojev.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/57491067473.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8da035d53b470db809163b1a9bc6bfa8/75781566791.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/1m8l2ed0gr14c9jvha12hcpl14/84610162310.pdfIn PDF document text
    • http://wenxuezj.com/images/File/fekesakafukuzi.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8dda2fd0282d5fb3bf88d3d0c987b21d/nuzifupikujunelipotat.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/delokekalugesuzurusuguzan.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/wapojutidagibojaw.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/padileg.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a85e673f8ac---90753222817.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5c844e465---luxokafetomugajaf.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/td2148vkkgdimtljf1vf036jfo/68998306120.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/pomotuniwufesav.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16111f2de2c5ae---paxumoxe.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/11255294973.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/54580250361.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/71953841566.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/70965454773.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e5488a404---vovugajuxuf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 11296 bytes
SHA-256: b6b10fd2147a6c8fc5fee18faa1a7143285252066bfb47ab36e3fcad94c16166
font_02_sfnt_off000113fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 19668 bytes
SHA-256: ac58455b7e0ed9aa77b9924b5a25dd99d86a204b7f1421adc78284fa48872773