Malicious PDF — malware analysis report

Static analysis result for SHA-256 be70190e87fe8400…

MALICIOUS

PDF

71.9 KB Created: 2021-09-04 07:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9cdd6445be7dc1cf90e74da25e1f01c0 SHA-1: 831ea8d54b5cdb2e4ff8e8f016ee80a873da7026 SHA-256: be70190e87fe84000a520b9d88bde59dad0eee1048b3837ec2b93999abd1ade4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages, indicating a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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=volvo+v50+t5+manual+for+sale PDF link annotation
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f8a492c4337---bugaxewijivazajo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9g65escf9k6mk1pjf54qvat8o3/66334847517.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/jebube.pdfIn PDF document text
    • http://cosyromania.com/media/file/romamanebiwidewi.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/619aea664024a3f484d2de839e9f0aa3.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/84139854978.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/sekusapuzodozemojoxipinuv.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/94290353293.pdfIn PDF document text
    • https://sealskinz.ru/files/file/4358535499.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7be44283dd---sitezaboxo.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/regutilifaz.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/xilawifiguvuvelawiraf.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/87367352519.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609820acadf5e---66515932050.pdfIn PDF document text
    • http://standardamulet.com/files/files/57264672638.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/gumaji.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd943c14a90---wopinenofav.pdfIn PDF document text
    • http://chinahongji.com/d/files/fibivazizitakowam.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/xenarevupubewipalu.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607debdd9e991---vibawo.pdfIn PDF document text
    • http://usmleworkout.com/files/file/jixopopasipokegigavi.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16081b17265925---64884131034.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612361ec93116---lazumapux.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/63929106151.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/kaganavoneg.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/92487560133.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_off0000b6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B2 10672 bytes
SHA-256: 46c399b2bee5c28cd0d6fc78cf1f12face7850eddcaf2b2cc00e4d9c859d125b
font_01_sfnt_off0000cf48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75A 16776 bytes
SHA-256: d7450d3670b8d94bfa8a0433e7cea53229fa1b1a812ff2e18f8d7a2ebdf1cd8d

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