Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb3fce2fd096487…

MALICIOUS

PDF

87.8 KB Created: 2021-08-01 14:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 158e1502135fc089ccb62528ab0115de SHA-1: 5ad9f8dfca669f8a60cc5a9f00255877e075f94a SHA-256: dfb3fce2fd096487dfc436ba23f38fd378fa04c76ccaf29ff8ff39797ab6adb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608132ea0b9c1---10718710908.pdf In PDF document text
    • http://jagdrevier.hu/upload/images/file/jewepalovunanazumi.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/jejojugutisarufiwenupas.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984123e84f9---juxabuvijabesofabenodima.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/43749834652.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609835f49fcc2---28014775846.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/7090d7289be13aa00767ba32fbca20ca/37254844050.pdfIn PDF document text
    • https://go2germany.ru/files/file/58147792384.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/65337753275.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9eef397d7e---48300553408.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/lubigitejuponibivuziwa.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d5fb63dd8---77777475191.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/30692081801.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d7ee2e45f---64378653990.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf4b651f3---milatag.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/39332489350.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f6ea3665c4b7d8429b3c0c24e21e2552/pixikuta.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160962fec2c36c---lageponig.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/gimixinedasa.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/31752105939.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/8lff1ftgk4qvgfhae8a4r8k0mq/suvoxivezin.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8af5b8fa30fc41c53bcd2118fe8c4cf5/nulana.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/595a576d112d04fb3cd6d32c7e385a66/tawiwupefaxedobixibegut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=kotler+y+keller+direccion+de+marketing+14+edicion+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 18344 bytes
SHA-256: 46b69c0b30780df662789b3bd75969f9210eff0867b65e52fc3023fe3381c928
font_01_sfnt_off000106a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB4 16408 bytes
SHA-256: 873ea64bb69dac911a97a70fc80aaf61b1693947149452aefb37e58b4ee09891
font_03_sfnt_off00013541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13541 11120 bytes
SHA-256: 5da188af962de0bfebe6ddd88d7bc1a26ce4f944301a997ebaedd47474cbbd7d

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