Malicious PDF — malware analysis report

Static analysis result for SHA-256 7887035191fa498c…

MALICIOUS

PDF

105.4 KB Created: 2021-09-01 17:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5e101f81622288e57dd2fccf513e5296 SHA-1: 771572d05d9da1897d2a443b940d9438fee798cc SHA-256: 7887035191fa498c8eb55bc71365d5f7810b19affb5ea7de37e9984586d0ec3a
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress uploads and disposable hosting. The document body is unreadable, but the presence of numerous URLs, many hosted on compromised or disposable domains, strongly suggests a phishing or malware distribution attempt. The primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://galerieportelouise.be/userfiles/files/mebomosuseruwobapitogaxu.pdf In PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/d954cfb6665232811d0c8561f2f1ba61/79051011512.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/47859181300.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609084736e5d3---12342550421.pdfIn PDF document text
    • http://zilalcooling.com/other_files/File/93488196916.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/fojerafufatufelameju.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/710f6704d2e4de39f41e020eeea32d1a/ropudabapubegomafidegave.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/rozozalaxu.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/797064f3a005298b02d94600183aafa1/dolopovaxokivi.pdfIn PDF document text
    • http://zuche0551.com/upload/file/jigawogozurovojirofo.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/5152129495.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160caae00b7775---morixagadojabazipavifa.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/12743072904.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/pokejekeliwo.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/xugurefumaze.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/22437956836.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/1430477313.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a18e97ee2fb---luxitanetisabiwomokev.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/rosaratekobizonapize.pdfIn PDF document text
    • http://dentherapia.hu/files/file/tobedusasamebob.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/pemasak.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bce8c8e8169---25537188992.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/v3cvk7295g24elsm39g5v12hrk/50925705483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=problem+solving+involving+linear+functionsPDF 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_off00012f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3D 10984 bytes
SHA-256: 601e2646fb43f79d1005676116f174247ec3c2916424d1be89b328f0f6ffd4df
font_01_sfnt_off000148cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148CB 20232 bytes
SHA-256: ca465f5a9ae15b73fc16d99d1e5b08cbe54ae001cdf01b0f627cb69ccf5f7773
font_02_sfnt_off00017eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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