Malicious PDF — malware analysis report

Static analysis result for SHA-256 47f625b61ac16f16…

MALICIOUS

PDF

78.6 KB Created: 2021-09-03 05:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f16ad24a41ca84824338a7e032e30a3a SHA-1: a33dc595e444916d2d8cb822948bc7842198e04f SHA-256: 47f625b61ac16f16987c43d4537f865fb3c25653f66952e66894c8f9edb4b14d
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm with multiple URLs pointing to WordPress uploads, suggesting an attempt to host or redirect to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/1qub8op4eqi2a1h55bsjr4vjsj/fufanipemenitudibigi.pdf In PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/e91087867b9d8fa35d9c0bab4cf6b677/ramikabemisamolesul.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16088b073d6216---74422512714.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/c60tfnoebtctu64ju3e6lau93o/86985937944.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/46707862884.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f7da82e3b0b---sotixawolinekogalus.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/46625398056.pdfIn PDF document text
    • https://agatanorek.com/files/file/fejidikov.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/74275164006.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1612523e8dbfda---vixewinavujifibixinigufax.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/26515485640.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///runesenojotisewubixapupuz.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/60879207352.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911100840d2---mebisedomamukobav.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/fawakiw.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0286700b36---23008225251.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/vojib.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/febefiduzegepalelebepa.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d901a42aca9---57531144939.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/cf24d3a835fea27cbf3afde3db19728d/fomenofifarekukuloto.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/golumalosaboniw.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/78433994452.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/0beadbb9ba6763cd5baebc09ea6cdd52/1825676519.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d53c4af7---nagadoderunevonolata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mattinata+leoncavallo+pdfPDF link annotation
    • https://mediaget.com/userfiles/files/21416636711.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_off0000cc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44E 10404 bytes
SHA-256: bef8c30db0ee81d4fdf274f03ea4e90ff78107f21b775c09d04b03eb4c6788ee
font_02_sfnt_off0000fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 18812 bytes
SHA-256: 227d83b805d0fa7932ce421e358d280d34db27bd634a4489791bbb955c701b17

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