Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74c865d49bc92c5…

MALICIOUS

PDF

86.9 KB Created: 2021-09-07 04:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 166c07e41d59ac1282e91e0f9c22843c SHA-1: 8dd9164629e2f42c078188a0a209c3992d3aecb7 SHA-256: a74c865d49bc92c593b170b455874aba9c54c648e40318094633b135331c9fba
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 websites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or to download further malware. The presence of multiple links on potentially compromised hosting further supports this assessment.

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 http://m2m2design.com/userfiles/timatewo.pdf In PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/894jtr7hijc7en1rr7roo8t42k/mawusagefadepinobutoxana.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/jebujisaruterudi.pdfIn PDF document text
    • http://insk.ru/img/userfiles/file/41140443761.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/mumafakefokena.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c628bdd4e6---givojix.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/m931vpkooht2u4ndt48g3pj6i2/3418619675.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080456510dc5---63503190838.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/33be2f2c6bf4584e1018b4f2d320cfbb/3081891968.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/287b3b92bdbe8b577d7106a13df76ff9/86569749199.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/74037026954.pdfIn PDF document text
    • http://aven.su/userfiles/file/53646363320.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/jurefigopot.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161264be77bc2c---42923854951.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/mitezatelideralori.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/hgvaakik81c5p0pir475s120mf/bebizenodip.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/baef78721b220010c908d7ddd70629a5/20017376658.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/9709659307.pdfIn PDF document text
    • https://invest.pl/userfiles/file/wamolupotofijemifapena.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/99104880132.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/janurepegutexa.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/61406291615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=convert+pdf+to+dwg+using+bluebeamPDF 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_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 19808 bytes
SHA-256: 50b784efe906b7ed09c0e7b8c11fd59c4399ffb747d1bc6652343ab1ab194fc7
font_01_sfnt_off00011bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D9 11264 bytes
SHA-256: 88914d5e31e6aff944936186a4823a2e6a2a2ae803f0285b72582acdd8316a16

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