Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d53dce8869f4bf6…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 10:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0ab236888dbb7fee3711fc87daefb9a0 SHA-1: 9c12c1c90474e6e9019bd75f975d5f4f5297269e SHA-256: 1d53dce8869f4bf6749ffeb85171248e24b02fc2591774fc673ecca794ca6913
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=synonyms+asked+in+ssc+cgl+pdf PDF link annotation
    • http://gianenricofabro.com/userfiles/files/jogaserunuxalagexaxipejir.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2dd13257a---nomezukodofexowixu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeee82f91c---18185816439.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210820111332_ddlodj.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ulj61utsdean0v171bn146blg7/jirinokumutojekefexuw.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/40181228821.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/83635583851.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/bovawedesoxixewuw.pdfIn PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/vevupefibamifoxelo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f979da6f80---75103804878.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/jojupinepon.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sn8tmpfas0mjpvieq9s9ss6361/titujovad.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b8699ce8272---70577738546.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/58f4704ee7b63d77635b8080b84a8729/powanojajibatumaleg.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/mowadafetuzagemawi.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/suxok.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/c66a75c1c2a830c5123527cb836fc60a/59203675550.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/wirojorezepo.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b739ab15298---bupavorokepafunajuguzi.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/kajiwawufutu.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/31156638931.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_off0000d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 11048 bytes
SHA-256: c1c7cb6fcff5f849756be29120e7b8223d0743850dc57d3a1caf6e28fe04bc94
font_01_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 18612 bytes
SHA-256: d844d904ae287d01f88d0d1627968a1e0b575f7d4c92a8a2bffce4986d602c6d
font_02_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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