Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b115bdff656f52…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 00:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 39c47deb0b6ef6bae222fc3707ae5d20 SHA-1: 5804be10350a3eed10a3973f8ffcd8120d01d01b SHA-256: d6b115bdff656f52e82efc6d5d73d243c00ababa487f53118f8445dece2e2dac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute phishing content or malware. No scripts were extracted, but the presence of multiple external URIs suggests a redirection mechanism is in place.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=turner%27s+frontier+thesis+summary PDF link annotation
    • https://keralahappyjourney.com/ckfinder/userfiles/files/5391976130.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607fefdae09db---kinojo.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/41206573627.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/mubijurapevakosifitefu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d55f3534fe1---8245929345.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/bozivemeranenem.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/25975190022.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/51479854862.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9343acbba---kirimegawelore.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/65965520933.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ovnk8f8ubml2eh915j2olhgrdm/buwujimofamodafewi.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/sdmv4dlol21g91lv1mbeajtlf7/10865410333.pdfIn PDF document text
    • http://sns.hu/_user/file/23759146801.pdfIn PDF document text
    • http://aimic.com/userfiles/file/10279016479.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021070421085862.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ff1c376d5---nukepipuwanopojotodajamax.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/96523050062.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928d4665ee2---walep.pdfIn PDF document text
    • http://954move.com/clients/4890/File/ruruleluvudapafabuberar.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/sivuvufiwa.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/6600682996.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f2c9de4e4abe6b4deacf87583e069af/76470091639.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_off0000d7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C2 10644 bytes
SHA-256: 501247a475e59e6ebfb83f13f306ed4bb20fccd866853d439625e5df043608e6
font_01_sfnt_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 18828 bytes
SHA-256: 4c6b4b5544a492dacadd72e4c39c54011824643b54dae7d5ac7f2f8014664c2f

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