Malicious PDF — malware analysis report

Static analysis result for SHA-256 858ad024d9d71a04…

MALICIOUS

PDF

86.6 KB Created: 2021-07-30 15:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 2629f21ddb1950d438f96b5d5145cc5c SHA-1: 99ad96da1ad0da75d83040937e198a3d9c3c402c SHA-256: 858ad024d9d71a04a4c8e6d9a886e43773a316584b6e4ee243b8ac181d269520
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=maths+tricks+for+bank+exams+free+pdf+download PDF link annotation
    • https://laser123.com/geektic/files/32563933866.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/86338630379.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/ac11486e50ad37966c134567603e1fc1/10634455548.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097831e80593---dadojuv.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/56195b5bfe7086d482e12d7d415f7607/totizivemarunaz.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cf1a333138c1c807825fa4f11249f960/larazorudejuvuposa.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/kaxape.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a3ab6e9b2---79472830100.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/db9319d9a69e265060501332d4ae0648/97941671207.pdfIn PDF document text
    • https://citronel.com/userfiles/files/mufuliwulazilebe.pdfIn PDF document text
    • http://tyextractor.com/d/files/kukikinek.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/dadobovozipusa.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/95174551433.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/186b9abfc886f891e91c1a8dc38e84ca/wejutekin.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092c91436362---papalavagil.pdfIn PDF document text
    • http://nessium.net/userfiles/file/jelefop.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/leruxegilegolaxebuwozawom.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/fotesexuvos.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/1cfum95jm6fmnngu53jftl7mfn/61945515971.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/22732019735.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_off0000ead4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 18064 bytes
SHA-256: d68b8c89940c8f704f46c9a622d6a9f7f481556b301583e6a3a538638ae37162
font_02_sfnt_off0001326a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326A 11300 bytes
SHA-256: b485307f8c1265c1edf8fec2b32fcf7aedc7885cbc4d9da485f46b631a5b91eb

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