Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89d874400205394…

MALICIOUS

PDF

95.1 KB Created: 2021-07-23 03:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bb9d3e71d53ca05d8fe1b11a7d0e8cff SHA-1: c50a0b8ba7a6a8cae5ddd30d6a7b35293b0ee754 SHA-256: c89d874400205394b88f83c5137af727c4f8979bbcb1eccfb4c198a56707e917
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised websites, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristic firings and URLs suggest the primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f53c022f06b82f1dd2a0fa85b3774bb/39783838031.pdf In PDF document text
    • http://stylekd.ru/files/vatamumuso.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/49103939618.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0999782e455d6b63837c0d947f04f06b/zekezatumi.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/4354860891.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160945e7118cff---xugapagefum.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc579096a0---74499918520.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/jbrhkv5dkt13fqnkalub1nia8s/lidakuziwefafike.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/kl0sna5at03us610g824updn50/57072701210.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/tizinopekigatubivateg.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/16706883522.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210526132052.pdfIn PDF document text
    • https://led7.ru/file/6680694889.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ae7cc4d7f27fc4e000931d7f8833e94a/66413024489.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/44cf13fd3660b54cd722716dec645022/58103704008.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/wubasevuluwo.pdfIn PDF document text
    • http://afro-safari.com/upload/files/60494064642.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/zofaveter.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/bulofaloronav.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/tizoj.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609f37a9b159c---43284959929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hard+recipes+to+tryPDF 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_off00010e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8A 17792 bytes
SHA-256: 1e186a6d90bd57c81811031eb25694a574283f3cbeb480aacb093a40cfbb0d3f
font_01_sfnt_off00013cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15506 10464 bytes
SHA-256: 3cd02507637427df4d6b6beb97560080e4e204c67de6d6686de24eadcf6d3459

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