Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8ff7b39ba74aea…

MALICIOUS

PDF

78.7 KB Created: 2021-09-11 11:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3fa0be237cf70677a70e1c7a685fd3a0 SHA-1: d329737de7bff706c9b43bbb2580fd06971005ae SHA-256: 8c8ff7b39ba74aea994f7fa7a2ed9071a5ad380e88c687b2de4469089cc5f1a0
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a payment redirection lure. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish for financial details. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly indicates a business-email-compromise pattern, aiming to trick users into changing payment instructions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://ketchas.ru/uplcv?utm_term=how+do+you+delete+a+hotmail+email+account PDF link annotation
    • http://werkschoenenverkoop.nl/images/docman/files/85394855053.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613915a2af8a1---wepivazasewisuguxojo.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/sujagezagibokobadixoluma.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/12583179123.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/widasaduvapojowimukeral.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/tasakuzemosuwirekixebas.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/66669934197.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/fenekot.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/xuvavog.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/zabadafubiditudar.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/xodew.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/notejebadetawujodidage.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c56312e459---gajilufesamarixeposuka.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/40566792036.pdfIn PDF document text
    • https://frisch.ro/files/file/67911692478.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/12706907436.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/0fed9f576314c8886be017c2b654b571.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613323d6244bf---91083535469.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/8qc59ermp3ql6l31iqt25rhcfp/tamojuvatu.pdfIn PDF document text
    • http://szcftz.com/upload/41463182419.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/5670614986.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/70572655647.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/segexumabugu.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_off0000ccf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF1 18272 bytes
SHA-256: bfb2a123965f33e9f5b303a8c8796e5445e33fa1e5619086c79a4d1c68bb4910
font_01_sfnt_off0000fcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDB 10656 bytes
SHA-256: 20dfca1e9ebbdc591c61670c5e09550194ff7d5a9d614fa5b602caadc1f38c96
font_02_sfnt_off00011515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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