Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c494ba94c79854c…

MALICIOUS

PDF

92.6 KB Created: 2021-08-15 17:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6579e93d9d9367eb95e6198b8282edad SHA-1: 60e12008c0596854cc6f6f80a7a1c2d11e151574 SHA-256: 3c494ba94c79854c1b801d1db70421622053f795712c8f9e1958d7f3be6b736f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f33a80e0ecc---91059249630.pdf In PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/62955685119.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/sunivalezimazisagixakorar.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/zipeganute.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/66236508826.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a15c66e1e3f380f5dc4eb3db19ccc50a/tadidetatisisopovi.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/f98d689e714fba403d7eaefdcb7f030f/jidosi.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dd0c20f5d---67597432619.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a96c762df3f---49648896546.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b38b9de7---vulutufoxasiz.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/2518246109.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f1553bab994---18227452474.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/eq955ogj89id61j191dpeb4k95/xemejabugagale.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d04bd28cc---7116997116.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/vesobaxirurarumajok.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/nipasafalanirozupa.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/tutefodama.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/razurezewutobalujijo.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843e500d805---pumukijewuvonituxon.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094ced903efd---5365958271.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16240567462001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=car+repair+estimate+template+pdfPDF 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_off0001083a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083A 17144 bytes
SHA-256: 02420eb62da25ac14168efac695f01d85755d5ad5888407f0f614403dab125e3
font_01_sfnt_off0001351d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351D 10468 bytes
SHA-256: 1e5306fca30357e11ac7b3ee8316ec8997ce51c73532a0b530ee03db82c8d461
font_02_sfnt_off00014ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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