Malicious PDF — malware analysis report

Static analysis result for SHA-256 315e39c780a209be…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 00:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 996ec8e525b7e8bfe71dc23558c7e031 SHA-1: 2be32c8bcb53271fc95b268184066071cac00ba6 SHA-256: 315e39c780a209be24ca92c86a700134f09a4bbd085114fe86c2c8c3e9649a2b
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 0.9993

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://meesens.be/KrMee/Tekstverwerker/28713252095.pdf In PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/malalijupoxodexuxapijun.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/2e7d4b198bf70f7b92f9d8bca44cb8a5/76651338476.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/kolujagevusunikiriwawodok.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/7cduf26pk72ecogr0tb21goq14/31984405686.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c4de4a469---lemusetofawilinoxadomawiw.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/d3db9d8e5d5e8856883eacd11e656b91/xebisevokolojotujudutona.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/b2h3rf41cm2kvka8b1eaojdmo1/40199066765.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105de1658791---11787937201.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/nuxeriroki.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2689240f8553e5958bdb273d60a2b651/75497566636.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210603152147.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/24334411df62d0b98de0fa9edf8f10e1/mizevubawuxiwemunukalivow.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/s0j29e4ag8dtl0r2qe107viv83/wipivefa.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/gujalefilatajebibizib.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/98438446402.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/7014398698.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/mosimekezasikebewozag.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8043b4c4---21206780514.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9b7d5ff67---6432710259.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f95664748---gabobuluwi.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/77237423827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=google+chrome+store+for+androidPDF 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_off0000d886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD886 10964 bytes
SHA-256: e9e8df7ffd4eb01ee0ceb111156bb4b4a85593d98ed612ea754007bfddfefee5
font_01_sfnt_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 17420 bytes
SHA-256: c668e678f173f334bfa936cc4c3d229bc3e86f533597fccda0600e57062ea3b1
font_02_sfnt_off00011eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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