Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a1dfa6faded5cb…

MALICIOUS

PDF

101.2 KB Created: 2021-09-07 04:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b449268812d7e9a20a8f43e4d7c47826 SHA-1: d38f93ac09bd46c662237cc349fd30b19e5af51f SHA-256: 19a1dfa6faded5cb520c1093bb378ca98b12d1801c68ffa00fd1ad5830437cce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to obscure the final malicious destination. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a campaign to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=2015+dodge+journey+manual+start PDF link annotation
    • http://ingpiazza.eu/userfiles/files/lewimorigiveduzomunuj.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/03faa329f4503d9914afc381aab707ea/10651122666.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609567c2c9501---7469904696.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/92840632164.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/1447067626.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/buwukufigerutemegeliveb.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/3117800dbd5ea155701813b4792c4e5b/85839595905.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16111f96f2dacd---pilojumes.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/kixumigeniturubafin.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/93838689506.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/wesujirifawa.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/31037991549.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4vvjtei203nhao5o7lo8e0str2/67404816440.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d25a92edf---93466424847.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/pavokaderamavururik.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/20647256657.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/25cd785ff201b01c1df061ab90972cf7.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d374d8b348---paxeriwudopuvafo.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/73968289843.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/82636248192.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611c57808fcd2---75563364689.pdfIn PDF document text
    • 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_off00012035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12035 11176 bytes
SHA-256: e2296cc085e00fdfe12797834b56bd8de6f34206abaa8cec8ad8328fa3b272e6
font_01_sfnt_off00013a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15261 20192 bytes
SHA-256: d926cb06ed7445df7c73eaa3cf0c1b984c91a314d285d99db4efcc25f03580b3

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