Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed8aa37a3af14d5…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 17:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6856ffea9de09f65695bb361d4f99db SHA-1: 8f67340d3d007f5383cd46f57e83ab40daa03aa3 SHA-256: fed8aa37a3af14d5cd0dc5ee67d4c743651221a8909411efd72fe367ec6c44dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a PDF-based downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/e36jri3gjj6qcnm1e2tlj54bc3/43180239136.pdf In PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/67ca619a6dc76cb92b842d7e3de9e69d/xegupebofumovuzetitosom.pdfIn PDF document text
    • https://sambelteri.com/contents/files/rizinidakexizo.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/65775047157.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/urqja5kov5ukk45ph4cvks7er0/nizipujajoju.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/96044780658.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/jiluwabuf.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e104d8a6204---634003881.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5c725f28bc49cf24dbadf08fcd722c2f/9544501155.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/cl2454p4tli8ob2lpn1254muh1/36498761571.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/49638750544.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96bdf267b---tuvub.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/37267318101.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/fopexibulifeketuniz.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/2fhvlnp49iom0o2gac2h905hme/xegomukanikatodurigaze.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/50420352282.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/9f18f6f8244c3fb6fa384e0ca3d83048/85274135543.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ba351b592c567qtsmijph79llp/riwukuluvujajuf.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/eirlk12otb3tca9mlhj8dceth2/jadazopozokimuvowo.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2abb8101d---65770941240.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/vobivubotebigo.pdfIn PDF document text
    • https://questyme.com/userfiles/file/56269910830.pdfIn PDF document text
    • http://ecole.ru/text/images/file/76312844136.pdfIn PDF document text
    • http://synphabase.ch/upload/file/89921024086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=skin+disease+book+free+download+pdfPDF 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_off0000d936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD936 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 17464 bytes
SHA-256: f46947fe40d2d8b374c7f93a0c32d9053157ff4b11fa2b89e7f103c130e8f0cc
font_02_sfnt_off00011e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7F 10784 bytes
SHA-256: 058c2bd0a95bf8a6f7d038abadba83a3e49004c9639d012dd77f5aba0e9b6313

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