Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0d38d5a0a13eca…

MALICIOUS

PDF

88.6 KB Created: 2021-07-02 06:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8f1bfc39f501f7822166f03f1ff945bf SHA-1: 8f0eb0fc1cfe23160500df8d677ff8e4b7d7ad49 SHA-256: 4f0d38d5a0a13eca273bbe0096b1bc784efd56f9ecff6bc1a0ea2800092b3f4d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The 'SE_ADVANCE_FEE_SCAM_LURE' heuristic indicates the document's content is designed to trick users into paying fees for non-existent prizes or parcels. The embedded JavaScript likely facilitates the download or execution of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=neural+networks+from+scratch+book+pdf PDF link annotation
    • https://ayurvedaemart.com/uploads/file/64429574480.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607005a2436ba---bulavitugavawapiguxijuse.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050618194918.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084dfa67c9ed---wusarixugiwamiburivuv.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/wimimifasijigupizonejip.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/9lt7obaauglcb58npvv5efo697/zewefisu.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/302e2224a8f10b78116376f6def255e5/wigefurel.pdfIn PDF document text
    • http://01host.ru/userfiles/files/lelamegezumimutonolu.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/70188581005.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160940f21abd4e---faxotinurisofeludugaputi.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/dogomef.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fef38b047---92880002067.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/79424584772.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/jipak.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fedca9ad98---28475860265.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/mijizibonagemodap.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/a4a71e2dd997edc72eb570ac32f3fcd8/5154882511.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/rivowaxaxuwures.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/74473150293.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073295a3ad05---nizixipulepujonikugevezux.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/307d78f052dfc04f23348d7818803068/31354197969.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/19957923749.pdfIn PDF document text
    • 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_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 11188 bytes
SHA-256: 69bb1bb301bf384e5dbaaad49275c30bbb677fd755e219b1235ee490d26a208d
font_01_sfnt_off00011125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11125 16840 bytes
SHA-256: a5e1ead4370217f617c1543942afa0416238e43562d6f6dccc1116a25ea3ed9d
font_02_sfnt_off00013d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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