Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0bac13a7551e944…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 13:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d760819771a4ac729aaf94936649b801 SHA-1: ea1dbc830d026ee3eae6e81bb9a1119cd1cf163d SHA-256: b0bac13a7551e944646129a51aa562a95617c6aafc7ca5174ebb62460d0269e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607070a982bdc---93175155884.pdf In PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/zumuzabubavativizodasezi.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/22870687990.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210529092830.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/647c2d8819094b79631f70cc15836f4a/81246549829.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d070541773---88015466727.pdfIn PDF document text
    • https://aaaxxion.info/images/file/26388142098.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/koxujodikelozutuxowej.pdfIn PDF document text
    • https://ewt.cz/res/file/sosuxudereruzatuzijova.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/c8f8ae88c5d15d917c651b22dbab01d2/22959257312.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/16060806227.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/naqk6u5mniro10h7l9rfkuh5c6/joloxasevafanin.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/mizaji.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/xowolobaredigurew.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a0afc7ade62---81742388993.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/nakivin.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/loxobafuderevinamusuvog.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcfc7a6b8b---5739349925.pdfIn PDF document text
    • http://aweibel.com/Photo/file/81797244287.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210709074333.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/vurepuw.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072b3de3b396---46851241989.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/86330373131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=tally+gst+mcq+questions+and+answers+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_off0000d631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 16668 bytes
SHA-256: 8c1231a48d8c2f1f84b8f2736bdaeeb62a3d14844ad503d36eb29d04317beb98
font_02_sfnt_off00011963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11963 11372 bytes
SHA-256: 498d438850495025cfef9ccbd6bdb33709287267fdcb1698e61683a64623dcfe

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