Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d7d8953fe369bc…

MALICIOUS

PDF

91.4 KB Created: 2021-06-26 03:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6f261c52a567ad98a201a0c1be9871e SHA-1: 5da023a9d13ba987df8a6838dc70fd5be9b455bd SHA-256: 66d7d8953fe369bc8e761dc602a35d3ba41fbb77bb7959d1270361b2e2328c44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The presence of multiple distinct hosts and links suggests an attempt to distribute malicious files or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083d4ca59518---jinekelixikubanu.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922b82aef16---92997339759.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/7ia091qt3n4hcmfbp5b956ukm4/99079810405.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/96c1c998553890065cb96f164918a30c/91786831002.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0569d04f2a5248cac81fd54bfa77fe73/zorabodikufax.pdf
    • http://asckhn.com/acskhn/userfiles/file/jigezobokupafukivekidi.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a33a02788ff---zazodomajalokobosugaz.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/97339703044f4027b05975eaec44282d/sarapavabo.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/m023k8t3roqtmk331r1ijektc4/10557213572.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2007aa124---98319853409.pdf
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/1974570360.pdf
    • http://musorcentrum.hu/files/article/file/65754799110.pdf
    • http://www.aadhar-interior.com/userfiles/file/piresoga.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608755857f07b---topejanatawe.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/f7504fee7d0cc81a6cbb36226285d836/67303080848.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da92316b66---99954699028.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/98a08b42ba7212c07d49860a2b8c79d6/66545743905.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/63fe9331a72bd853c908f91ceec55fd0/95685967383.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/5e4b0c06632af78c1543f552a47b3291/kuxixogejekanoto.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/tfp2o5qr1g9vas74qebdoq87pf/25093677841.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c56b2d9b9df4d9e0ded2a3f96b7dd211/vutolusema.pdf
    • http://etasystem.net/userfiles/files/ruzasi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+combine+multiple+images+into+one+file
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/e6b07322341d4573a124d2e03face072/xuwupinobapolerawakoviw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a8.bin
99a22ac9dcc8c8e6956ef6d5013c29f7fed9a8ad6a7c1424df15d3c0ef7171b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 11040 bytes
font_01_sfnt_off00010028.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10028 16792 bytes
font_02_sfnt_off00011839.bin
e601d58cc44a3b71219076811dc80441aadd4577ed1ce922569271c19cd22205		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 16388 bytes
font_03_sfnt_off00012eca.bin
063275d6460a8243db1b2aed9446a80dcd4f23e6a0f1a58b87e5a6dac80b94cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECA 18204 bytes

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