Malicious PDF — malware analysis report

Static analysis result for SHA-256 4056a6a6566a7ca5…

MALICIOUS

PDF

84.8 KB Created: 2021-07-28 03:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fca2165a39b5ead840a9245b3a6b084e SHA-1: ee3b5f2b61db1f8a9333fceb3de9d2b4481a4112 SHA-256: 4056a6a6566a7ca572250a2c6e2c0c3f96057a7fc61be41f22b5ef42d949089a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs and the PDF structure point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://faizleathergloves.com/userfiles/files/88098198699.pdf In PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/0d940156f0409095d06888233a644a7b/35775846013.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ac1bce94b51d3219e8ae043d9e8a01e6/2270889854.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/sirepasenajabonofa.pdfIn PDF document text
    • http://camonetinternational.com/files/file/69680635634.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/73a3c68d323030b2a09950e4a388c729/punuledoxino.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/89779407597.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/mawurifiganes.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/zadowawulosozimewotutu.pdfIn PDF document text
    • https://zop.bg/webroot/img/content/files/72195806317.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160943562728ac---tenasatafumaxevu.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/d2edd695b85d1353e04ee992e28742b5/tubuvelefupu.pdfIn PDF document text
    • https://strechybenesov.cz/content/2722365960.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/0496ab229d0784c0e5440a7a833e1eae/liwaxazopux.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085742b2c18c---31937748367.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/13040945998.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609a66283d09a---vobiw.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/fumeganevumajewut.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/15826332766.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884da6b931e---35711919018.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01456aab36---xuxuzagitovobenituvom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=xiaomi+airdots+user+guide+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_off0000dab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 22580 bytes
SHA-256: e44f17b0e8a46d8d2950905b8a28a9429eccc49cd39f2b5a6d57a659cebae2a9
font_01_sfnt_off000111e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E3 10800 bytes
SHA-256: 4160ad6680eb5574a0bcdc4e99fd117f770fbd066c8323dee6fed349317743d2
font_02_sfnt_off00012a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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