Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd71037a778dd8d2…

MALICIOUS

PDF

87.7 KB Created: 2021-08-29 12:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a99856adddb7501680826f85caa2edd9 SHA-1: 84553d344fb9c0b0303a8c8171f57a93182a72ba SHA-256: fd71037a778dd8d256b8035e1a868cd7dd41bc35f94cc90f52ec4e46e047bad2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The authoring application 'wkhtmltopdf' and the presence of PDF-specific heuristics further support its nature as a potentially malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://coretry.ru/uplcv?utm_term=reiterated+meaning+in+tamil PDF link annotation
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607dea39ed247---76304156549.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/bulapuxolodax.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/57si9oqnlek3nk49ggf81cqqqv/lanazigokelumavusifubonu.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/13590102798.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff006890f4a---16884808598.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dae9df71fb8---12474863782.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c68fb3b87---79792168916.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/37431224436.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160753823737d8---70092539531.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/73e126f99e1845f6ebc94a0f293da145/83261087769.pdfIn PDF document text
    • https://egca.fr/userfiles/file/pomop.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c0c5e0bc49f61c03059f9afcb59d184a/rebuwirotuvoxuwapamek.pdfIn PDF document text
    • https://xigmatek.com/upload/files/sotigafonoreduvufowejoj.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/rikisazosijoferamozab.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/bcf2c1ec3d19eff1d0c5b25e653ff0d1/vobijilalamopasu.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/fc8afc21d2a638b42ae4a3e5c1afefc0/kilaxatiguwiwezebowufap.pdfIn PDF document text
    • https://x-software.cz/data/file/57852304646.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160db3337a06c4---52233055890.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/nekugebasafepijow.pdfIn PDF document text
    • https://coluer.ir/documents/file/foduxe.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/87520591963.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/26828597244.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609da5dc4e7c3---93360624942.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/4f2ff7f2385a383ac68486cbecae4749/10949530910.pdfIn PDF document text
    • http://health-bridge.in/upload/file/9206928204.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_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 10348 bytes
SHA-256: b92f9cb97ac5c3e9dc15789ac095f8f4cbbaa6882102155ea89b317505d40e97
font_01_sfnt_off0000fe6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 22144 bytes
SHA-256: 45b2fc738ad13ec60296126feef36fdd018b003108d8b4779ac8dabaef9f8d13
font_02_sfnt_off00013813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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