Malicious PDF — malware analysis report

Static analysis result for SHA-256 f372301e69175b64…

MALICIOUS

PDF

85.0 KB Created: 2021-07-31 22:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f3dceebfdf86adc655f9ba6e1210b79c SHA-1: c69f42ca42df0a7832872578bf284350eaaf8cb2 SHA-256: f372301e69175b646de379e745d78361db74b6eab55b5611d3a58ec0641766d8
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to malicious content. The presence of these links suggests an attempt to deliver phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://ndt-tl.ru/upload/file/binesozoxikasurenojawib.pdf In PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbc16cf7ad---78598471660.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebf69ec94b---lokisedesunegekodipiz.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/47640082605.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/9r5j5c83v0nkpej49bj8n18f76/83527828841.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/62444371679.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/48417553589.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/62c553185cbf9532728992b8ba6c9764/66211108412.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/48420745bc2e5475d0b92864e63ad482/loganaxijenedigota.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/92106421980.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29227cd1da---86148255784.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/47pbqparqs55j1d46gccjoa99c/bifud.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/xurezivodudajatizovala.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d6d1136fe---20050828276.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/kopixiwa.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/68796041148.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/68281869682.pdfIn PDF document text
    • https://cecprint.com/images/file/41157885647.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed9104973b---matunesevobunoxiterilo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/12a160363d08f39f4fafdee84f1bb67e/92735357233.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/81392731807.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/98741506079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+turn+off+gaming+mode+on+keyboardPDF 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_off0000e805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 11004 bytes
SHA-256: 9d09948ae3f099ca77b47cca3ea06423eddc5c3fb0ebc28a49d366d8c7c0dca5
font_01_sfnt_off0001016a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016A 17112 bytes
SHA-256: 316d7a035afe6ca23f8edec62ca38e2de61d2807104dbe4aeae5e6e93f36af86
font_02_sfnt_off00012e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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