Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf67b6dd2a71ac98…

MALICIOUS

PDF

83.5 KB Created: 2021-07-09 01:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f40fec4dae1519acb445fc86384170f9 SHA-1: 69dac5484a2c9264c8b02f272d84c74c9c231385 SHA-256: bf67b6dd2a71ac985355538e1888388f44102413e4b4b2bfbcd751ee27203f3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, forming a link farm. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lure users into clicking these links, likely leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/dvt9mo20ppvq1b8gkarme59non/95430950559.pdf In PDF document text
    • http://bilmatbasim.com/userfiles/file/85230138343.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e5e54be2---ridusofafefunumom.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d5e478c62---77846696383.pdfIn PDF document text
    • http://asfalon.com/__files/file/loxinumulomidumuzejupe.pdfIn PDF document text
    • http://gabortech.comadmin/file/setulofodatododawasika.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/59925322894.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/mojafofi.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/1ijtrspujt45bpa8oq2kppi9ho/noxepefemaxilinixejotuwap.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/toguxewawusopidop.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/806psdfd5fjtjro92nvprjvlh0/57791229250.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86f8b3ab72---94389357949.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/44631297226.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/gelozor.pdfIn PDF document text
    • http://polkovnik.su/upload/file/43811134936.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16086a11b257e0---sekisatogadibalutev.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160abe44b673a4---zonijifolasozibaz.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/75539216637.pdfIn PDF document text
    • https://bloomeng.com/uploads/72624185580.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/16116329659.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/36906615160.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a854a2107a---44186504749.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/xelotegorawi.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dfddebf0d---28439048130.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/qooo1ae1o6j7qokb8dkheor9cc/jizororigogebisevepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=simple+future+active+and+passive+voicePDF 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_off0000e31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31A 16784 bytes
SHA-256: 51c2bc4a5a1c3d79fbe6e9556189efad1e33b12f98d2eb6b28d9305fcf49844b
font_01_sfnt_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 11020 bytes
SHA-256: bce08cc0642ee459e7f76d36dc19a1425153b693f575f4519b24930123a49395
font_02_sfnt_off00012869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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