Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb9a12869d0b2af5…

MALICIOUS

PDF

103.6 KB Created: 2021-07-15 11:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d4897964e1773304200bc9da788b1606 SHA-1: 307608b4816a9164edd124d2f45dcd4682f1575a SHA-256: eb9a12869d0b2af5b62b9f22e7c21084b081be9d6c0e8dfa0a27c6497ced005d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other domains, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9682

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://cructi.ru/uplcv?utm_term=t+test+degrees+of+freedom+table PDF link annotation
    • http://artpolinakuzina.ru/pict/file/28148772942.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c468450e2689d57137b36aa46652c73a/vemukedunozolisogisumi.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/mevozaga.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/sumetulevanijen.pdfIn PDF document text
    • https://edusfera.pl/upload/file/marosumefewuwe.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/66fc213eca74a13f614481fbe86031f2/vakowuzunatusemapezod.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/tepewezikim.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/iii4qehpehi1bh31hfb1vnu1n4/lidusagozamukafi.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b785613d010---81520444965.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd6d60feb2---fominofolid.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/bsjvn8kap47017v2pmb3r6bupa/rajebitowesapur.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/040515207686.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865e8349387---wimaze.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/c20178797e06c63d800e3957b0746fd5/vitogatikisutadepup.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160758108c210b---41139378271.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e45d9fab5cede5a3b904203df8c98441/wapirerapisufesiz.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/006e099f0e5c4a59f23ef96621b68a14/mupisiwupupuletuvujosi.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/fc5e6d6f7a70b4bb95b0a2e65b2b83dc/vajaxoduxisipuxi.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/tamuwirikapuwajagizas.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b43cb2bf7cc---66533714329.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b8fdbb817---detagaga.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/r9ag4f22b8vncb7orognumva1i/lezixanuboxu.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffea962c36---somovezuvus.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/bilanaliva.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e935f5a524b---vagobavag.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ca8d3dbcb---19785949787.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7F 10604 bytes
SHA-256: a61a156f49e5294a787234208ffbecb84952b9c7ad533a6966f9e40c6853a284
font_02_sfnt_off0001458f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458F 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_03_sfnt_off00015ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB7 20028 bytes
SHA-256: cd74f94dd9e537ad36bd6e6e5d7d0134a7b9f389bfe1e5e91ba80256ea03ab04

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