Malicious PDF — malware analysis report

Static analysis result for SHA-256 af99b3aa816a7a78…

MALICIOUS

PDF

88.5 KB Created: 2021-09-04 14:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0577562b3c72bc6e651f765269a22a39 SHA-1: c6a6f080285e58815df2daba0017eb1ea794b1b7 SHA-256: af99b3aa816a7a78f78395b8fb3a2f9d0028759bac74744a4f14c3cb73e7e231
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious sites, likely for phishing or further malware delivery.

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://pinpointfeedtech.com/ckfinder/userfiles/files/49395633269.pdf In PDF document text
    • https://mobiligennari.com/userfiles/file/12017424090.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/20275350345.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/94905828044.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/4064325519.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/10915510320.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607568139ab2e---32132295009.pdfIn PDF document text
    • http://mrmax.ca/clients/9797/File/59583263626.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/nadebixufumurufuxutelebuv.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/berufosuvabalozol.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca0b0bac4---favebigofo.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/60639340028.pdfIn PDF document text
    • http://dothi.info/images/files/19275450545.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/71937426440.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/n19ctcatlrj2fs86td6q0e6jc1/55369166769.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6792df14d---zutuz.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/c9e25fee53869a90355040fdc65de95d/30435459146.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/miwexofokulobipe.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5c9812693---24677739942.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6888f8c767d7bc5a514f0bccea873891/wutimunokamisatekodo.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/d6f481d66e8ea6d717abd9318453b82a/69154792784.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/abqn9n3jghpkupr0vtg8d1qho4/24764335468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=vietnam+tourism+report+2018+pdfPDF 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_off0000e70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF26 11184 bytes
SHA-256: 46d42108aaae7cf6d28ad427913b741ba952de2877bf2cb3f89900173130a675
font_02_sfnt_off0001195f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195F 22584 bytes
SHA-256: 12715e4ee1463527595c87dac45c4fc94230aa6de6d30b3792ee3bd25dfb9e6f

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