Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3263aeac3b8bc8e…

MALICIOUS

PDF

94.6 KB Created: 2021-09-06 16:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 9a39a0a4d1265bf992ebd14804be4bc5 SHA-1: d8830754064251cbe58422aeab955b8c4f251d5d SHA-256: c3263aeac3b8bc8e3fedf20fefe7a1b2a36165c4b0607dc6b7a69c8911fc2bdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=logistica+empresarial+ballou+em+pdf PDF link annotation
    • http://wolfpackbasketballacademy.com/content_docs/79587130552.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/duruxuduki.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d60c376cb8---wuripegobakasepozimoxog.pdfIn PDF document text
    • http://sbcnepal.com/images/file/regemigeweziki.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608614bac4301---55843342497.pdfIn PDF document text
    • https://fptica.ru/images/file/banabopabonapezem.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/5cnifn34fg7gthhchqu8namir6/bogojetefero.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/sisonufonewosupejip.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6bd866be3---60947208436.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/bewamogopexobeguxex.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/drp8k0ckeobm7820d11huhrs94/17467284034.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/94342934038.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/i4pot95aha1pg1d5hp27qhanfb/39045237142.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021051816081172.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ba2fec0bb---fekimusazenukixus.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/81520217031.pdfIn PDF document text
    • https://birotex.rs/images/files/65381384582.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8nov9ga85o56tsa8n4vg0mo43u/gefug.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/82334870382.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0309b374f---30132581967.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/98639687243.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/guganif.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_off00010953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10953 19500 bytes
SHA-256: cf5d25ef60d69c222c61c5779595962bbc8038fe48a1675c54ced245d5907f02
font_01_sfnt_off00013b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B99 11056 bytes
SHA-256: 23ee09df488af1aefe566a972c16243632fd50446511fc3aabb2380b0703a76f
font_02_sfnt_off000154f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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