Malicious PDF — malware analysis report

Static analysis result for SHA-256 f409c532a8e11449…

MALICIOUS

PDF

72.4 KB Created: 2021-09-03 22:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f010b2f1073a4d0f26cf5595e4c14ecc SHA-1: 5800040270fe07eb1b44a590f657c3f5c8a8d285 SHA-256: f409c532a8e11449460ab458b814eaa7b1c9a825ad5a8b8cf29a859174a4fc8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=editing+and+revising+practice+pdf PDF link annotation
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868015f0148---92681911851.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-3/20210703102835235008.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/sojalu.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/wabane.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609061ecc3fc9---61198467208.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/32805707373.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/tofan.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/jigokizawakunobumogafava.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/66623587420.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/96615122882.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/pamubimubulawepodijeze.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/vobuwirom.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1100a4bf75---26648928262.pdfIn PDF document text
    • https://nistd.in/userfiles/file/22033709747.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/mubur.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/f2pekh34cgf9a04fqaq9iguti7/95486848575.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/57130337769.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c19db3c0fe5---76654730198.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130416ad631c---33618017406.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/06edf72f051c5a543e0b3489467e0474/boxitifojasaxaw.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/wivuvidudelupi.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760418b6882---zafuki.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_off0000b938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14A 16548 bytes
SHA-256: 354f0dfbb4f82275bc800c1cdc7172087ff1feab5d13539d91831aec9b3ee4f5
font_02_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 10680 bytes
SHA-256: 57068ea01d0ee602b08302634c115e5305a5c32f8d33486e0e462d94302997ba

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