Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5ac4c6ba6fed80…

MALICIOUS

PDF

78.3 KB Created: 2021-07-29 17:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 547031fe5d1ca009f8a23b7b75dfbcdc SHA-1: 0d5e8239b6bf77803343769223c4a22737b9a7fe SHA-256: 7f5ac4c6ba6fed80ca0aecebda17287a537db6f0746ea8e3d210de4f1f24a96f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://krisoc.ru/uplcv?utm_term=f%C3%B3rmula+qu%C3%ADmica+del+pent%C3%B3xido+de+dicloro PDF link annotation
    • http://brilspa.ro/userfiles/file///dajaf.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/45235069825.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d46aedb00---pugapinigox.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8727ce08b---27389609298.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/90652294727.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/fularega.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ngpftr89niri2ocaa30ccdssm5/85972991320.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770e8d7a32f---39955617105.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/sebonakitupotutixomokal.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/xeputeko.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/vupegukulexufutiso.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/jerig.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d019f5d8521---nedesaxegukifodusuwadi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hsnlt88dgk2i0a5iqcaffkplu0/31619709673.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/89482752840.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/lubujoxirirelemafed.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72a4a5ba25---67082075630.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160cadf9007442---vumufatexepuje.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e56f3355645---lawinuzakoru.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64555965161.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/zasevorojegitoxidu.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a8bcde69047e234e4e18d1e9d8f1aa6a/13963862673.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/rdncp2nq05bne9s258p8n1mog0/1485977635.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ed1811f37bf---87065727335.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090be0a76b3e---jidasunux.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c213816845b---nowafetomoturekorepovijem.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_off0000cba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B4 17340 bytes
SHA-256: dad2bab53c7acd1e01b82a856697909cdc10b18f904633501cfafff358a47ff3
font_02_sfnt_off00010f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F21 11032 bytes
SHA-256: 5b9ad26c2270a286ca1572aaafb1529fa2c8cf5ab47d912775c84f12885c63b9

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