Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8eab29395ab78f3…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 22:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 961c456189e6f29342a37d0ce9a09a73 SHA-1: 1d9b9ede007cac42ef4667b15213b553f7c59b42 SHA-256: f8eab29395ab78f3621bb171de3bb57613b89a3049d605a97c671d40aeb99541
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of multiple external links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://siblom.ru/files/upload/file/41483598805.pdf In PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3689bc12ef---pigit.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/6998361221.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/24b86fcf22e4f9e24c25ccc4ba7fa69d/pelifujalewifekepeg.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8b3bc2f36feb944b777347f76fac5725/besotupokojojaladoba.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/mamug.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/18kmq15r3pdaitjn91ae3es9v6/vazit.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/412f2dd6e6c02ea4ca8d781bf0d1d9fd/58212798467.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086a6fec2c13---funajijosifulape.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ff3bc7bd2bf---78276256773.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb40eb555---ralosupenifewulasamo.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/94436714358.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc9fed5f68---20437304003.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a891e550125---kitodumanonasiwo.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/74546276756.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e4519904---vapupubixusadesowexinuxi.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ff2e0e0706840d83d48b695b716b40c3/rokeranexaxafupokabu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/dt8pa2v5mmr3ns4i62puenorbo/raguzaraz.pdfIn PDF document text
    • https://togeltop.net/contents/files/lunisuzuxojewakogufuneram.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d04aea5fdf---14007168733.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/32101066392.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/34eeeff99db7a74c10708095c1dc3f2c/gilazaluzevixojakitomit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=schulferien+2019+%C3%B6sterreich+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_off0000cfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBF 11284 bytes
SHA-256: 3a0d15448cacd56acb24795e70040aa2b6b4215192a6685b42967e9f62b788ee
font_01_sfnt_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 19348 bytes
SHA-256: e0a943d3939e56843a684404c29b2b23c6f6265eef2ba514378f97f3b98f94e5
font_02_sfnt_off00011b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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