Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8eb0464c02e270…

MALICIOUS

PDF

73.5 KB Created: 2021-06-10 22:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd94bf7c884f33a6adff883678978cc2 SHA-1: 938688ed1fe182ab0861cb15ac833ebdc87e6f8e SHA-256: ab8eb0464c02e2709fbdd25b869579b9bf3437fe244b2279617fbe4693ad5024
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the PDF acts as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest the document is intended to deceive users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cructi.ru/uplcv?utm_term=simple+future+tense+exercises+with+answers+pdf
    • https://aawyx.com/sites/default/imageuser/file/70597813706.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c7e61bdb8df34225025b29dc37d453d9/falukizegi.pdf
    • https://emmaushuis.org/pages/tepureguvajebakapig.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a393bc74702---64576436446.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/0dd9aad2efde4d181e5f5b0bd96395a3/39129528861.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085be9556175---detufopemupi.pdf
    • http://curry-box-deluxe.de/userfiles/file/78163882097.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5a82a847---sugafifefukeparub.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/fe8d00bf5569d568df5adbba00d0dc17/nerilupopaxiwuz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9bda68fd---98025435545.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4d3b27d3f77fb46dc80b9458be668601/vokigupu.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084a9dc2c3d9---malutex.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160980929b1ea4---lozexesapigowagovisenirin.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49fb9cab5d---65778125294.pdf
    • http://didocrosby.com/imagenes/file/sedukixetu.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e78a28207c---dadug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e603.bin
27800345419282bcf42958f76f3c1bbbb64c0b120e57826237513b05659a7d39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 5660 bytes
font_01_sfnt_off0000f92d.bin
273b78cffe6800fb6ce8755f9664a57e4ed1d0f7f27a4101f2c117db450eb6ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 10448 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.