Malicious PDF — malware analysis report

Static analysis result for SHA-256 8168d41d1ee84a1a…

MALICIOUS

PDF

88.1 KB Created: 2021-06-28 04:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f4a3b7f8c2e4f5e6aa6c08b787028122 SHA-1: d280fabe816b96658b3e86e4540eb4496b6a8c77 SHA-256: 8168d41d1ee84a1a65fca79d512ef384501ea4aae4526f9005078feb33b74731
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. This structure is indicative of a link farm designed to obscure the ultimate destination or to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://antae.be/app/webroot/uploads/file/dosuzor.pdf In PDF document text
    • http://asustainable.com/global/file/81574464606.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d1c0789e0---32441663308.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/vafusazer.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16084c7a4de9c6---xugaropufenebufuji.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/getededobapojinopevobone.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/buminurarojusex.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78687d7c65---nupemi.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/rajubukinumiwodenikemor.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c76d76574bf---58410801774.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021062422571470164.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a218387e55b---xovogobisaru.pdfIn PDF document text
    • http://minerva-collection.net/files/files/36341162569.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070515bf032d---movurilukavugivupi.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/hda252kg1h5rdjlh0kaqfq8ivr/kelaguzup.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/b1a554f46b8916a5801734e3af8fc555/napugagixokov.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/37389209217.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/635725f9a4a7bd64821e69792244f366/lotorotipewukujiwi.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/86fdc0955c1fef54457e7bb92a2a3bb6/kezuvemugof.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/puwezitinezeja.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/cmh3tgqm8fhneelfps008h3mdt/71864399074.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/33407899746.pdfIn PDF document text
    • http://www.uniformsolutionsforyou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf72a3222d---80633612449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=is+2d+animation+easier+than+3dPDF 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_off0000f427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 10712 bytes
SHA-256: 4859b6eaff7f30e02be7d421476edd09ee78bda58d4a50b44aa4d864a1e21781
font_01_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 17328 bytes
SHA-256: aa1dcf6a6a0ba77fb09414a0873be83d89e437c029e3da92f4ca77664ad96b63
font_02_sfnt_off00013998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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