Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb3f5a9ef3d2741…

MALICIOUS

PDF

88.7 KB Created: 2021-09-02 15:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0bc464ded173d4bf6e08ce05fdeb349f SHA-1: f03ed2d2d4ceca23f11c7864ebecee503c59635d SHA-256: 1fb3f5a9ef3d27417e1c0b1d4bcb707858a69d41e3b86b5e825e2ac5ec3c48d3
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final destination and potentially distribute phishing or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3d5312046---88524841798.pdf In PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/tipolumajiziliwuza.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/jalunusunafuxegakeguleduw.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/95220571452.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/93080563257.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/gazisovezepobokov.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160d668199efd0---lutewedavaleta.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/vodojaraw.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/59523999379.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/93216016770.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/2f5f8523b2f1b4ffc5464a8b10fbe28c/6829658498.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/0eumue4rf5olr4r6j1qnf67gi2/69669646400.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a729201ea7d5108f47182ea07018729a/83430091575.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608029b6bbe57---pukobikipawiguxekija.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/39024743238.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160def0f3df37e---98446076908.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef8d049f28---43927429430.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff54cc1f343---33161382939.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fb7251c3d512cfb68560928cd43dee68/75339986975.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d505df13a18---rijivexafowefijig.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/51312567398.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161065aa87c187---dokado.pdfIn PDF document text
    • https://tigapilar.com/upload/files/90779687907.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/6913189650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=inferior+alveolar+nerve+block+technique+pdfPDF 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_off0000f6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D3 17384 bytes
SHA-256: 63bf2d106a2499f16b28a279de1996405653036ff9e08812af831e872ef90f01
font_01_sfnt_off0001239b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239B 11044 bytes
SHA-256: 2b1f68c8080ee10cc6a3faf3ef2352dfa85ea82e271b2941c5dc79645e4815b1
font_02_sfnt_off00013ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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