Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3145ec27cc3a60e…

MALICIOUS

PDF

89.5 KB Created: 2021-08-25 05:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5b4a274d626ab5cc0483a128d4bc8acd SHA-1: c24c0b73d75f2e1a7f028c58e63aa06e8bdba1b9 SHA-256: d3145ec27cc3a60ebc5b0459acd9a2429b26a134bc76a7a5ef1ec69804eddd74
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 0.9934

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=chitterling+dinners+near+me PDF link annotation
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0e471f873---91806764124.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/ninefirevokob.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161028afb49acc---72859358600.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/91026679379.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d21feb1727a---23872407753.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090705a3bf17---60774640822.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621241173.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b1ea7966b0---83785055042.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/64615771780.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/napegigevibixozonelaximim.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/pededovifo.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/0vsv4s1dfrhf47n4mi7qeo51p4/50131581758.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/xudimadesufuwizopizog.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/aacb74c9513ada416ce8625af72a8130/baluxodudugusurenedefefob.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/juzikimetenawatesikudofus.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/79908945191.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/ef5725a2897382f8e01ddea7ac9b82df/580728392.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/61694158951.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/dd625963b1f3e56b26cc2c67de6bf150/69968006159.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/0dd4672b6dc30270f1dc6b8671b73193/puvuv.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/ribujugoxaza.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/b37983a491e526c6a72e52415d271c10/74104056019.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/rulosiwafe.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/54279661643.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 4172 bytes
SHA-256: ef8f99d34da37fee16dba2ba2103ec7643b94507d085b9f7b077c0ee6e34ae91
font_01_sfnt_off0000f86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86A 17844 bytes
SHA-256: 76fab9514bc67f853be3ecb4e1d414a81cb8d310511a04771662af5f3e1284c7
font_02_sfnt_off0001269e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269E 10604 bytes
SHA-256: 1483e4260bcb6f5146740e8144705c536bd2ef752fbf7a7a4f7a97ccb23a0638
font_03_sfnt_off00013e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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