Malicious PDF — malware analysis report

Static analysis result for SHA-256 263ad0a842178e90…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 05:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08896117767e398173787104fc626b19 SHA-1: e4f29c2d64ca1056b88f7543640ce59b542ee23c SHA-256: 263ad0a842178e90de7cf2ce4d4a6a42ea43ee50ca6373953db1d369205e479d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs, many of which point to PDF files hosted on compromised WordPress sites, suggesting a link farm or distribution mechanism. While no scripts were explicitly extracted, the presence of multiple compromised host links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6355b73a4---98371062964.pdf In PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/fv2cjf6nb85h9gmvet4jugq9bh/63292479359.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/tozidivige.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/9512043403.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/73ff2d347d3fa094b7eb16f22c617d15/87457837901.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/tebozotebimafagiza.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1ddc25e1a---52479554336.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/2ba055bd58f555ceab2a5d908ca33c83/ruwemuwimatogofuruzu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926ad6310c8---77674189086.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/kadekeregevogibupisi.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/96002898004.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/55883770831.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/bogugevalavigujutusuki.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/74521251815.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/fumupivabomudawevegepov.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609815a9af469---jasedu.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/sujili.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b55dbc0fc6---99833925170.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/zebil.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923c305b21a---38281169136.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/tatidovilap.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff38cb9208---narev.pdfIn PDF document text
    • https://morabia.fi/images/file/mijiwejaxawujesozemelenab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=shuaa+digest+march+2019PDF 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_off0000d020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD020 11184 bytes
SHA-256: 77f0f311e2b880557d6f21d89f26ec3bd94574bfa5130b648502d52c93edd7dd
font_01_sfnt_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 19652 bytes
SHA-256: 322fddd08eda094c40f2859cb5f53d3273624a81f03c35d6f956872d5960882f
font_02_sfnt_off00011c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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