Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a9d5b4c2910281…

MALICIOUS

PDF

86.6 KB Created: 2021-07-01 10:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd42f653de9151d70e0fc7bff4fba208 SHA-1: df4d419b68a1d784c6a4a4c70c145e5891fd2e6f SHA-256: 18a9d5b4c2910281310b6c2e0a806fc508b5e583eb5a47d7a5a1f4a6a2c19909
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings point towards a malicious link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb508d7831---rarafakabi.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/28101749b6f60703428b33f0142dee43/73735715274.pdf
    • https://alakharia.com/public_html/userfiles/file/59277608693.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ab62a5e35---zeropise.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3ef452e07---39785606764.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6d5754360d47fda423ece09c086352fd/16290656794.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d445fd49f88272928e8b3f66d3ff82d5/lixigobigotonu.pdf
    • https://sanipacific.com/attachment/file/jadisepewalisobo.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607604dcaae9a---34238755952.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/b194175b0685cd83a306039de729a64e/10219864468.pdf
    • http://novichiha.ru/pic/file/jatidumokobinubukazeni.pdf
    • https://hkbca.org/UploadFiles/file/20210603204240103.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160bb651be8f8e---fitojuresuwisipetobosova.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/1qvm5frcm29n7310cmib07mnl7/moladafekomavumedusinis.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51102634595.pdf
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/wuwafosupulopusu.pdf
    • http://barbusci.it/maisUserFile/file/mavowa.pdf
    • http://ash-graphy.com/userfiles/file/pejurotigefenubujuku.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/zaxubezapomotakaze.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c701d91dcf---25953960797.pdf
    • http://enotecagaribaldi.it/userfiles/files/23058626970.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef0acd36ab---65130354235.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ecd696ed643a8afb4673298564b610bf/defojewusogikifedim.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5espbkr63q3c04ludr5j6fc6h1/76849967554.pdf
    • http://agroanaliz.by/upload/editor/files/moxabavilexomemipinakolav.pdf
    • https://bhsbeacon.com/FCKeditor/file/deduw.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a796b2a9795---xitezejadovivudisujaf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=severe+roundworms+in+puppies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f178.bin
f0df2b5be47c95adf73b498343b909158fdcf176134b306b52d40f98ac396967		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 16744 bytes
font_01_sfnt_off00011ce5.bin
fcf0c8cf0f971054672c40ab50544ccb787a1951a0dafdbf59361991659f3a42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE5 10572 bytes
font_02_sfnt_off00013501.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13501 16792 bytes

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