Malicious PDF — malware analysis report

Static analysis result for SHA-256 a263aa82821399a2…

MALICIOUS

PDF

70.7 KB Created: 2021-09-04 04:38:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a143a9541f064972274f70cb4a9b2e87 SHA-1: a0a62239b74cbea165b0f1194da748bc2743b66b SHA-256: a263aa82821399a27b37e990ac79e1907df797910b56bebe60afbaabb118803c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d48bba35---sovifaminowolumide.pdf In PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/gizatopivejiweloravav.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/tagopaxudinunod.pdfIn PDF document text
    • https://silga.ca/userfiles/file/xaledidurenosuzo.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607373491df03---mirimuzukomalofajevopizub.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21c7884bc---nuvikapaxaxojegikepowijur.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/64537647989.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/85712928364.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2fe09b579---88329601451.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/afb9039cee7297091939ab4838ad8d0d/tizuzinedovikuzonadi.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/nazebadorelevunejugabo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28b24decf3---sapelebuvixudixizi.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/juwejuxigedematem.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/75529711416.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160852c194bc3e---foxafiwudusizul.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/33241496050.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/3a4dd68682561cc595bb13dbcddc5ef8/sopazolixagikoj.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a60b8d986f---82200544777.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/solikem.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d122ee47da2e46b245e488c7e04f19b2/78574937382.pdfIn PDF document text
    • http://revtechnik.cz/userfiles/file/2486271195.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/84736045558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+does+manual+gearbox+meanPDF 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_off0000b5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F5 15524 bytes
SHA-256: 9b5ea85e714d5813f8a0999165a59fe52f781117014187fbdc141f57464bae32
font_01_sfnt_off0000dc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1B 10940 bytes
SHA-256: 8ed5e4094cb043d6726f84393204a75e17e8835284fdb7bca7f908b37fbe2aee
font_02_sfnt_off0000f517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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