Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f349cea890313fc…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 20:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f73b52fb195baa546bc13c900e41e016 SHA-1: 4d9fd1a25d48c0f0075cf0ee3404650c5954d138 SHA-256: 3f349cea890313fca8e2f76a4edaa51f5675294fbe88b56a0c2f35174d291f72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca5bd6c0c---rejojamilupefit.pdf In PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160881c75b3a1f---18796648472.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/jti8lsphtdpgs9s8if4v97jiie/68251858415.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/nudaduxopesapiw.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7b9a6f23c08cf0aba2a2cf53fed851f0/73705432478.pdfIn PDF document text
    • https://triosms.com/userfiles/file/272738430.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d1c0e9e6b---bapevufugobedarosig.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/a99cpd91j9rqlm35d8oltg0g41/94094401621.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/98344373034.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/10659303957.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/vowujuboritawetedexufawep.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/2274086231.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/33648780451.pdfIn PDF document text
    • https://tavio.ru/files/file/nitemopus.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a38546d78676d63affbb9e352ae691d9/16011685923.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/kimofurutesosamimulajiki.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/5c3728dac0f45ff51b94cadf261ef118/50249269533.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/gaxukizulasepadojutonuwuj.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/rexusulimixedodoko.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210627041447_mew4jm.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/86761223404.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fc642eb9111cfe06a3bad3c75389197a/bujabagidaganemifi.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d87f856f0---luguragederunarutabixowek.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/65a1d9a563061003c54476e10b1a9df0/20017327263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=adobe+acrobat+9+pro+extended-pdf+reader.editor.creatorPDF 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_off0000d94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94F 17288 bytes
SHA-256: 18434ed732f20ebcd088a4a18f855b67a1681cf42b9f235c1ef3a2fd058a5ca0
font_01_sfnt_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8D 10888 bytes
SHA-256: 7d9ee6a096cb351bd115488f555cf7fa90d43dae67007c85b0d01ba5f617d8fb

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