Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd98e37f43bfb03e…

MALICIOUS

PDF

93.9 KB Created: 2021-09-05 21:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94c6e22fc6957e5214a29dd893193dbf SHA-1: 0aa582d32e6691f00fda207e010c601195739534 SHA-256: dd98e37f43bfb03e6ec1db5dc6ba2c41e4e5f9fd5d3cc54883958149fc80a1cd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=curso+de+ingles+larousse+pdf+download PDF link annotation
    • https://nacionalequipamentos.com/ckeditor/uploads/files/dujido.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160db44199925e---98440800693.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/61adca415787f7ed9a3577e7d2495998/72696482826.pdfIn PDF document text
    • https://dhesient.com/media/16364383344.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/363e892d56e40e8214d8c5bb6bd9ff6c/54319931842.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/zudodula.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/cf17b94a825bf52f4810e6cb70b757fc/45190497405.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/29677430008.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/70588485585.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/98858985481.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/9d79a881bde3d6131b42b8f397650571/pururumigejagibinusetux.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/vuwudanijidegijepuko.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/24230380108.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/piselojopudosamu.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb673b0678---27170858301.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b28f48b8e91---76622211337.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3524d8db52---82588685808.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fce24abcc1---lerix.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc195b517dd---lojetikepopapomokovofujif.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611f8d7c95516---1124912034.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e731f0333---nipamelikofovijoje.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9ce7a9704e8aade6f55eba06bee08b62/bexitipomuwagajoguvig.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/kilonoriwipesamokogepi.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/58524541646.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210613144841.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_off0001061d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 19656 bytes
SHA-256: 10423f9f3e918449636882955e9cf0f3a676a02564928e5773ddf9fa1d7fc8d7
font_01_sfnt_off000138df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F6 10792 bytes
SHA-256: 4a2ae6af8fef29787a1e4de03ec5041ffb4cc3f3ecca72bcc0fe7be33a93e644

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