Malicious PDF — malware analysis report

Static analysis result for SHA-256 1948ca77ac909eb1…

MALICIOUS

PDF

88.8 KB Created: 2021-09-21 17:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 44857ea2628d167302c5f5f483d2c052 SHA-1: 1f2a5f2cf8331fa997784785f9b424c9ae935322 SHA-256: 1948ca77ac909eb114bc81758499bc318ed2f1e436d12a8ee2d6437991bdaf74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links likely serve as a lure for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cissud.eu/uploads/ck_editor/files/nabufutetilokow.pdf In PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/nipuwifazerefapel.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/31815297963.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/17659915322.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/53688817575.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9c4ae33de---toreteparugov.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/vavenore.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/45401155035.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f972d64617---15058004221.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/xaxenumo.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/peketixuvosuxiviwadine.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16130f236757ce---begunumano.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/pevuvu.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6488043470.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-11/images/files/18550192143.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/3483981034.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403cc6e07d0---68942540952.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rrbespkqkqfnm0fqj5v561f74j/dejogibegobovojizagudol.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/folugunimijidebafaxil.pdfIn PDF document text
    • http://sciattella.net/images/file/93311463977.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429e2c6f547---86062167048.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614522a57c160---47920663692.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/56057041673.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/94895700111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=edit+photo+download+pcPDF 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_off0000f86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 17736 bytes
SHA-256: 440391ba5a1c75f2205c3da6086e80a3cd06319f25ca1226024553c2386f4a60
font_01_sfnt_off0001263f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E56 10280 bytes
SHA-256: 76f003bc31bab27c99a38b60afc6b878696bc5666f767bdd27d79da4309b7ade

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