Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0dbcae8c0ccc3a3…

MALICIOUS

PDF

141.9 KB Created: 2021-07-05 09:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7963d504e87f3bd2991d434bdc13c322 SHA-1: cd907f8c6fce43b87e948d27a5ff382edb06c29f SHA-256: c0dbcae8c0ccc3a39757a77c3013d825934c9d2fbba6f7b8c9ec783afa65d2a2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various domains, with a specific lure impersonating Microsoft to facilitate credential phishing. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to exploit user trust and lead them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+check+digital+signature+in+pdf.
  • 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://didopack.com/files/15107357569.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ba7e0d940---mowotazukabowugudiwox.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/vigon.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/giravazafuko.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4c727276---minosizadeko.pdfIn PDF document text
    • http://altinay-law.com/images/file/88768452990.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/zizuradijiva.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a91b25f9bc---gigejuzatujifedoju.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/si1gp93l35j4448ijnt83q6cb1/gabitewoxevikum.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/xuvavesusofufopevogome.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/adc59b0f99471cea5a8e62e601245ed5/83738639704.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608baa56ebba5---bikaf.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/27691081315.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/90938988092.pdfIn PDF document text
    • https://penal-garazh.ru/files/20044273394.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/puzebewowewobituki.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a437095b15---28887802065.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/67816207108.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/81525647729.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e475f1205---tadabivijetobu.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/4n2qo4k8bnpl8j544saj4umd85/viwetabunokegikume.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e6d7acdfc---90789599133.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/61539235836.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160943a61ac8a6---65897174139.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072574f8c78d---26629951188.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/29049565594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+check+digital+signature+in+pdfPDF 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_off0001c709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C709 11168 bytes
SHA-256: 9b973be1d3c98c6813a1c18bc3e727f87c41c479f567a702377f1e2f2ab558bc
font_01_sfnt_off0001e0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0EA 17708 bytes
SHA-256: b1e40c1866032523e5acf04a6698d070b9d9f72b00f092dd3aa7cabd26f1ff71
font_02_sfnt_off00020fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20FB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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