Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff502488cc7370d…

MALICIOUS

PDF

86.1 KB Created: 2021-09-07 13:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b87f2ce15d6044658cb206fb8ecea8aa SHA-1: 9a8cad5a367af79316b496581d01c86a45a55c77 SHA-256: eff502488cc7370dacfbc9ac2af9ae352d00aa88ffaba8e11be19cab1ebbfdbb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://travelspace.pl/userfiles/file/43639329694.pdf In PDF document text
    • http://lamachine.nl/userfiles/file/gowimibimelem.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f05642defc0feba4d023acbafb9cca7/41337915760.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c511208e1d7---92884840212.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/20471897869.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/47091909739.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/xozupo.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccd2416de4---20210814327.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/766978f10289981855bc7ed1680c99f8/5821721926.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/82818563568.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/farevanusonabuwel.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/55317974818.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/77409170764.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831fd852e9---vemufivuku.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e74e3927840---64309830416.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/51ad6241c2b98b8f71990d38dd73709a/xezojokalabukivozi.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/60dde002d7768.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/fda17544f12b0f44f525a17b7aaa9896/fakalene.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/zanumokilivuxidefumo.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/subunedomovovafotubowexu.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/12fba9a19cc13c2b873bb39148fb9496/fesevumo.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611e44a79b6a5---5925539341.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/pujanodifovaxuxok.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/podalemusomi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7d243fe35---26928026836.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/lojogabasixowulis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=house+plans+in+south+africa+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_off0000ea74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA74 18156 bytes
SHA-256: 91a886bf7e515492bd84f23303f5d9b722f39b45bb4f392c0c7751b516355dcb
font_01_sfnt_off000119ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AC 10808 bytes
SHA-256: d119ca56756f65f73e5a4d687dc04e933952caa4aceefb564a2911cd99a27b9f
font_02_sfnt_off00013283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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