Malicious PDF — malware analysis report

Static analysis result for SHA-256 90435c3174540472…

MALICIOUS

PDF

91.3 KB Created: 2021-07-28 07:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d9407ef03636e0125af865debcb86153 SHA-1: 7e4827de40dcb120b79f0383a33a06ecd72ad11a SHA-256: 90435c3174540472e864ae5c12768e25d85ba19dac04e4b640629c8cd119e113
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting this. No scripts were extracted, but the primary attack pattern involves directing users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://adian.eus/files/galeria/files/pedotexivolewibu.pdf In PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/c8b5e309775dc234aed3f23d5053c03e/pavobukusufigamizubi.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7tr5b2nourjeuoud8tc6nou5sq/kusinisemelesokefenugu.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/wujixijedixabe.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/46908a8a8509d4af6bb651a2cfc77c37/zisebexoxokifeg.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11fda6654---womevaxuvaradajunipewe.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/96a61f17e73618a814c79fd5d396a722/85553292471.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/en7nbij50kfaqrkat6lp45qe6h/7297411268.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/74751087203.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/3224c7dbce1d41193072c6cdcf0bc1e3/39798845725.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/43732239978.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/lurujovukegogo.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/7f5e75a9a4030d3df35ec48eec62054f/pilizerubekevadavajapu.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/dezataworo.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621605899.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/35a60d273b9a2bae5652ad733353b58a/tasefubuxelukawotusirusu.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087364142f84---movesadut.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a4a239ae---24574970862.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/25655770971.pdfIn PDF document text
    • https://castel.ro/userfiles/file/wesasosezogimurofugujel.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/fefatajatuj.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/78e59ae33243f9b04f2695ae4d7f9af2/rulobasejoxufetogotuwariz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=como+saber+el+positivo+y+negativo+de+un+capacitorPDF 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_off0000fb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6A 18836 bytes
SHA-256: 70c4cbba5c66f30f252c7dd4e9ae2297ce2568ec01d75f021d6675b50995ecd6
font_01_sfnt_off00012bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAB 11308 bytes
SHA-256: 69f77955508508e6e31bb36d164eab7845b934aebbbcf328e0f326369edbe5b9
font_02_sfnt_off000145e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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