Malicious PDF — malware analysis report

Static analysis result for SHA-256 87705d7f431e88bd…

MALICIOUS

PDF

96.3 KB Created: 2021-09-14 14:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e3cf91934879aae91fbdbb955c365b43 SHA-1: 136e3b3d8671bda7dc22d9a963fbb87faffd39f1 SHA-256: 87705d7f431e88bd23f688afc6c580ed75debae2b5310a6e2f2f8178e7078832
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URIs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pixomot.ru/uplcv?utm_term=check+sd+card+android PDF link annotation
    • https://morethancars.eu/uploads/edytor/file/8259740466.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396aa994d02---74619297268.pdfIn PDF document text
    • http://punaide.com/userfiles/files/14332520674.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/nevawizokim.pdfIn PDF document text
    • http://ccshecea.org/upload/files/17243324036.pdfIn PDF document text
    • http://odumakus.com/uploads/files/kuseresorirugini.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a0b3bbcd8---lesamofufejorogerosane.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/nisawivupezoxedopo.pdfIn PDF document text
    • https://casaalu.com/luutru/files/71569735770.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/guxuxokemapijokot.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/gepapevunotevanasixi.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/kavuza.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210914122242.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/41837280628.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/96682148530.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec69547cda---97350040526.pdfPDF link annotation
    • http://mariondhuique-mayer.com/data/file/gamiz.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/derikom.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/37488660382.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0a8ad62a6---22890041982.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/lenitidu.pdfIn PDF document text
    • https://palet-school.com/files/files/fijasisipimi.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/pikedafataxafufedegas.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/loxofajet.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/denamu.pdfIn PDF document text
    • http://plise.org/userfiles/file/70336872375.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_off000114ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CA 18256 bytes
SHA-256: aa978f6fed89a9766533ca7e031dd33a22a0d2271accb4bfc094f01b7f050aad
font_01_sfnt_off000143ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BE1 10448 bytes
SHA-256: df75a4c0254a5999524462c7b91aba4150a8ae4d392abfe7e1279e678d687853

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