Malicious PDF — malware analysis report

Static analysis result for SHA-256 eecf2883a40493fe…

MALICIOUS

PDF

150.1 KB Created: 2021-07-02 06:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b77f80d84e0a64ca4bfabf6c55831b8e SHA-1: 571ba7f5a9a9d8b382d34bbbafcab224e868b66a SHA-256: eecf2883a40493fed82869d1f7c4665c13fdd8c7600301723b7f521d3e109c84
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution. The file's structure and URL patterns suggest it's designed to lure users into clicking links that lead to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cae81ecea---68578202609.pdf In PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787e6bcb0a3---35864269215.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/fg4uedfad32o2f7v6vh28e91p2/xodifomifaxafutusefi.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/85774cerhko733t3s4vnk3g2qb/relimavuxegomip.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c9ad53e5---nutotinofenamodenu.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/r631aosr2miudhluf7hftmr9eg/46373158943.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4d353dee6---18216950825.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/c533a62a4f27731748e1c9a866495aee/30157385433.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/vuwamefagosobukukuse.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879f4657353---94458170883.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a4090d727---127178977.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c9811157a4e0f59cd8f46ab0ef772e7b/1142487486.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea325a264c---kiwenasilale.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6a7d1395c---nibipilefulub.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/xisegogivobe.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/cdetdqsjgcn220bf5f6enav5s1/noparawulonaxuwuf.pdfIn PDF document text
    • https://castel.ro/userfiles/file/85789145944.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/jokojafozaxobodedunuxuvax.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc30bb1139---tugidavo.pdfIn PDF document text
    • http://imaginove.eu/data/Files/86513754579.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cda7cdc65---dudepawanafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=most+touchdowns+in+a+season+rbPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3CC 10740 bytes
SHA-256: ecf1bad6b7c7bb985257d664298ab7029cf21a4423d8895c69cf37364b67c65d
font_01_sfnt_off0001fc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC8A 17656 bytes
SHA-256: 34fa43db5a5f3e1855fa8f19d974f2fe9e0d22bd8918711e85424a3deccfe094
font_02_sfnt_off00022a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22A8B 1636 bytes
SHA-256: e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500
font_03_sfnt_off0002325c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2325C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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