Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7f9eae6cb5d9bd…

MALICIOUS

PDF

85.4 KB Created: 2021-06-30 04:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4a884ec9ad32ee8a6cabcf82a0d018c4 SHA-1: 1d1a76ea51a69caf81e4682460d1fc12de80e22e SHA-256: 7a7f9eae6cb5d9bd42b9cea39246dbcc7b0ef9265ed55ecd02bebe56f6173c31
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm or SEO poisoning attack. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of multiple compromised CMS upload links suggests the document is designed to redirect users to potentially malicious or manipulated content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://bkht.vn/userfiles/file/tagufobijaliri.pdf In PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceac507cb9---noxakikebukinogux.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/8975fc8b66ba246fb290de5600fbd124/labegeravovinulosubaxo.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/6135018e37e031a0b0aef1c8ba20ae28/41992881716.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e080e0de---80692208699.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/71200478922.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/butivokixalorog.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078c67e66938---megivoj.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/lozivikitubigam.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9de9a7ea6---95214744093.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1da480bdab---fiwafujejatofevu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098581669bde---telibilafovosoruf.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31b8ca2421---52595445391.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae43dd13e0---16289721172.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/74608627820.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a89b806fab1---xudekofedowetibe.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/ok201qfcnleidjnqhfjpdi641s/22277488038.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa357f588---36136370137.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aa6756798---81695843568.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2d32ea316---70887533589.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/4adea0bc174fea46deb23cea9070345c/wakusabuxubonas.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dacac8579---tafexiwafokidaweladep.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/pidifenawawonot.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/38099788448.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/u7puoqu2ag188nhse60d0p9sd1/tunipesilemeguso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hey+grill+hey+pulled+porkPDF 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_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 17040 bytes
SHA-256: 65b0f24fdf5f6ecff56036c15cf071c26af574ddc18fbc59bac0dc7fdbb8f633
font_01_sfnt_off000118c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C8 10436 bytes
SHA-256: a2e1be35304da84f5d6ba5ea0dd5bf79036a4a014de77e20d325ad1b1d3d609b
font_02_sfnt_off00013041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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