Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55ae48165b577dd…

MALICIOUS

PDF

76.6 KB Created: 2021-09-07 13:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a354f97afc4a7a372b7b2480d3ed5054 SHA-1: e55bad2a0488ee8d30708a090f9a5cd1d484e310 SHA-256: b55ae48165b577ddb37c1432c2b72ab398b3aff531075580fe8549d617f926c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristic findings and extensive URL list are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://inwebjor.ru/uplcv?utm_term=english+colouring+worksheets+pdf PDF link annotation
    • https://agrimal.pl/userfiles/file/wutubiposenevofuxivaw.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16088fa9abeb21---29136117851.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/c019bf347d22748bf740512225adc6f8/90702896999.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/xurumewifafizukusodirelij.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/rotidibitisasorisi.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c047af69b4e---95825094864.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/kikatanuvo.pdfIn PDF document text
    • https://advik.net/userfiles/file/549569804.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/25181357432.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/39d091f53b89081c5888e32bc544d7fc/12740389726.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/37664058007.pdfIn PDF document text
    • http://canadanur.com/resimler/files/fetivuke.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608108727437a---duzugajetusuxobijifaxedaw.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/64348132501.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210806_8BC9E38684246D8C.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/wavaxozowetel.pdfIn PDF document text
    • http://vaynhe.com/upload/files/fagemujajejatufibamizo.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d247fde7275---ganovovurotuna.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/956f090603d8fc7c936753b9c4f41b4f/5394751370.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/25757351258.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094347472bef---48241476149.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/34778060106.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608816f588e55---rivujipolixuvexajekewu.pdfIn PDF document text
    • http://fedime.org/imagenes/nugumojakimefiferatelu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AF 16576 bytes
SHA-256: ed057c6641d0548e2d8249f0d6e3217f9088ae5e73f37e8d725bea7fd9e0fdf7
font_01_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 11000 bytes
SHA-256: 801cec44d1701c05496a51d2f616091a02117eae0d0543e9f1df9aa2bacf519d
font_02_sfnt_off00010c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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