Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5996c2f8d492038…

MALICIOUS

PDF

85.1 KB Created: 2021-07-25 19:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dfee0e189c4e60666033175417b3b0ad SHA-1: d2941f25fc831b5dc3741dd83dcad243192b3ffa SHA-256: f5996c2f8d49203881e6d72edb237c1f4cc5c40dadc76498bd526c524c158a19
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, with many distinct hosts and links pointing to potentially compromised CMS uploads. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to external, potentially unsafe content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medicapoland.pl/uploaded/file/69341354303.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/22ee026b71c884778e90c4ad498909a6/21776429613.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/zejetivapu.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/2940328992.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608179898c7e1---toboloxajegolesila.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/36e1f292e7e6cb33358f8ebd92f0760c/pugurovubogukeke.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/67151819083.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609daf7919392---muxivororu.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a8241642cb66f2fbf93643812a308f84/mosubapijiget.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/nubamotuv.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a70836718b---taborupivunupameremuxew.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/mekijiwekoxofu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079747567e9f---befabafolamaloxade.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/60425106139.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/l62f994pc0agu0u5s73aek6h95/jufiv.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607419c4ce67f---gejiz.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210719075144.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/86051134123.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/53207178211.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab48716f6d9---68926116313.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/a9cmakd2m0mvroghlfdfsm24f4/72148186035.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/bizewezopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hard+reset+apple+watch+series+6PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B2 17376 bytes
SHA-256: a76394ab9606127805a3526621e9e07f170ee1be3beec4ab8c1790381abd37c0
font_01_sfnt_off00011429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C40 10632 bytes
SHA-256: c07c40f98d3a16a30e2196aecf1c95d81a58e38f81a7199014c1e0bc8b691b0e

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