Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc84e821b11afbd8…

MALICIOUS

PDF

77.0 KB Created: 2021-09-03 03:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6e45dd6ede4b41a8745b050d0249418 SHA-1: d4f4b7ed3c03a0dc2b025c5eb47c3a345b770761 SHA-256: fc84e821b11afbd890f27c73defcb99872f3086784d5cf8336d79d67e80822c4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a 'Pdf.Phishing.Trojan'. The document contains numerous links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'utm_term' parameter in one of the URLs indicates a potential phishing lure related to business English resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://faprosid.com/file/vudozudibuturajawefiki.pdf In PDF document text
    • http://ambulanceservice.pl/userfiles/file/21325906712.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ce4cea7003617e5e3fa93dbf81b30c21/kupepuwovezariwobunazijok.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/70925459712.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/3fbd7d5b49c1f2c66baae578ab82848a/zabovoxizodupefemaz.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/pejetawifajawemasovoniju.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/jaxural.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ed438ac59---21788133449.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fe6c1601410339073969007a1bef96c9/tusebemapopasixokona.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/875fae229f698b0088d4ce23d1eb3db9/duwabemiwonixij.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/56590290966.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/cb53d1314d6181a8f4a1a3e2efddb31c/xadinazo.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611797840fbd3---pamegojesovepufipofa.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/fufazutubukubelo.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b850e6887a8---4843919043.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/90545133526.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a87d6ce1eed---dekupoxemodibedevuregivi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/tfqm8c5j77ejmbhtsijjuqtfu7/72224416003.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16091a0068643a---80120586309.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/45950941837.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/94747649060.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/jugekexirubipox.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/fidapuzukenovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=intelligent+business+advanced+business+english+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_off0000c6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CA 10936 bytes
SHA-256: 90adc07b3236482ef4890e5184ec2796be3ad01613f9134f9a3980efac7a1f20
font_01_sfnt_off0000dfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAB 18272 bytes
SHA-256: 87015dcad20e02c5d89328d42d8f02468761fbb6c2a7c2063802d6b238bf1229
font_02_sfnt_off00010e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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