Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efbdd748c1e9a96…

MALICIOUS

PDF

88.8 KB Created: 2021-06-29 19:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 858e2d2845a5815ac03cbd70e2e923e3 SHA-1: dea96eeae5896167ba6e4d8f88b2f23a9db36f08 SHA-256: 8efbdd748c1e9a965d78358b6b3de5a67e124c0abead27563b8f20b65038a093
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised or hosted on disposable domains. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://chcial.ru/uplcv?utm_term=engineering+scale+to+architectural+scale PDF link annotation
    • https://internationalmedia.com/userfiles/file/gidozelasakobasefofob.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/doguvupafuniwulepofegit.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/36945528459.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea68e8e1e0---taselajewujadevebibibe.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/48578747013.pdfIn PDF document text
    • http://halaljones.com/uploads/files/33037800363.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ffc9c85c81aa197243456e70e1113903/kodirogogimoxuxo.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5c2644432---74100792769.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160717126e9b47---duzototikijibedaripude.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ckvi1ts8toul1us4ci56lmi67u/siroladukijezorake.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a34bbb5c25---56038500088.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/a7783a9c980a464d35dd76e3c6181430/babunafebodigawu.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/gefalesur.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/3ca4e562fcc072e9b1da63028d2d400b/nepilena.pdfIn PDF document text
    • http://tinnaduraflex.com/uploads/files/mefemuxuzexexumaxadur.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706b5623707---mumapifaposogigidinaro.pdfIn PDF document text
    • http://chinazzjx.com/d/files/62332685588.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/6aff692ffb295aa62ccd3d050a456c32/32397535656.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/7198972344.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/nupubokamogowamune.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4073657d2---pasalusugax.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087525b85bff---gofelurulowuwofefifeb.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/60c14ca0208b0ab6b931fcda4424f8fa/58116239034.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_off0000f906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 10592 bytes
SHA-256: f966b2330cc6ce0ec0030f6c96976d69b2282224f2b220f6d2cd6c031a80c014
font_01_sfnt_off00011129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001293b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293B 17216 bytes
SHA-256: 72e1890ce71e400742ecc1a0a1952d9bafd6d6c4911f0599b10f6ee2a28d78fb

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