Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e4e8f484e29609…

MALICIOUS

PDF

82.3 KB Created: 2021-07-30 20:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 677b15b2502f492fe5fb3b851f61bc30 SHA-1: c5d7c168e1cdd5f53199a92db07caefc0c915490 SHA-256: 71e4e8f484e2960965daf03140aebae417a344f28cbe23fac53f80f27bad038d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Several heuristics point to the document functioning as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. The embedded URLs, such as 'infrive.ru', are likely part of a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=how+do+you+change+the+air+filter+on+a+frigidaire+refrigerator PDF link annotation
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089a50aa209f---24298742200.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/2nti3ja15bd1643mj0bekiuah7/62717639784.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/23723628107.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da13d34e1b---ruduvakozolibo.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608081ba9dd74---jizipunis.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/35422675095.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/merunufokifibe.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160726dbe76eb7---16411353185.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/62304141143.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/bawodiwowunavewow.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/woresiwupewaronamoz.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/fu2q5ehqamvdap1ntdshlkd416/63770087787.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1b4b0c02f03a4ee41be839060eb996b3/wururude.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609485477f54a---mumegodaninenijojitub.pdfIn PDF document text
    • https://inncredel.com/uploads/bojivozufili.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607549cf8553e---zonevuripefomokase.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/40476675899.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/20911954273.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d01a95cde8f---64457146442.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/f1dcafe66a14f9a018c6ace0cfe3ad9e/3021248227.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/8399821030.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/93252625718.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/34083677476.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0hdvuo402cvqpd76vla7sq92f5/lajiwokuxutevidivuv.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_off0000db73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 10876 bytes
SHA-256: 9f98f9f4ca4b0d41809b13c7b49f1aebed7ef3eb1270e32bcd3c93290f232f57
font_02_sfnt_off00010c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6C 17904 bytes
SHA-256: 79bb82bf64c49fe0af3d6256dcee9808119bf2587968474fa75b899ab8bce2e3

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