Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18dbd356c120e9b…

MALICIOUS

PDF

70.7 KB Created: 2021-09-11 08:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9eed0439825321a34f7fd969262ae0fd SHA-1: 2aa26bb5d30933f952769522b0b82268f713e137 SHA-256: b18dbd356c120e9b18ff8adddf94b248cf96109ff9bacb398825d2a3fc96299f
196 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a remote-support tool lure. It contains numerous links to external sites, many of which appear to be compromised WordPress installations, suggesting an attempt to distribute malicious files or redirect users to phishing pages. The ML classifier output of 0.997769 further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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=splashtop+android+apk PDF link annotation
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fb54c28e9---melajonu.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/nurosulogazagezurad.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/9718490183.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/82519280849.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/58132962773.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/bepukevevitid.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/dedetusu.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/82197950292.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/duzijulewetabe.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/31851845221.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gaxunevonexel.pdfIn PDF document text
    • http://donghotam.com/luutru/files/ledewazo.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338284352cb---pikese.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/66045221426.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/86507297624.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/6626357384.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/86085459404.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/vozutoj.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/94814911827.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bb26d1500---putofev.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///najidujigoxateb.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/92131729030.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/77386515431.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_off0000b31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB32 10524 bytes
SHA-256: 1ce2fe8256aa178a1f4040e692155b07642c6c3c682ff173dba24e3b2a85c472
font_02_sfnt_off0000e304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE304 16736 bytes
SHA-256: 5d81ad807cb09ab0a58f853432c942f1dda375e064a9a0a3ba63a2985a69c920

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