Malicious PDF — malware analysis report

Static analysis result for SHA-256 6507f1fe3601370d…

MALICIOUS

PDF

92.0 KB Created: 2021-07-05 12:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 13fa36905be50adc6573525520590404 SHA-1: 8239046a386df3c8d2f7a352e094fcf1510c00ce SHA-256: 6507f1fe3601370dbb19dd4abf3c254f5ad7b84cff3186448e3091eab29e29b1
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 WordPress sites and disposable hosting, likely serving as a redirector for phishing or malware delivery. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to exploit PDF parsing mechanisms or host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://medvor.ru/uplcv?utm_term=time+in+tyumen+russia+now PDF link annotation
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/6d861acec47524cf7a4e414fc9b1aaed/wugufonape.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/c6215eq8inbee482dkr09sr4ml/vosafavel.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/8gclrqq3f3susbsv4i4k8qhe1f/zuveti.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5808ddb61---5379332952.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/370374466673574619d6b6e949e552b6/14898190223.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984032b0fb9---11502377432.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/dabedifediteniwil.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/98374243253.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/8qg6snn30sjtmt34nl43pkm92l/kivigeg.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1ab2071de---77110191373.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/3839d5e89ddeb8b3b6b9cc985379650f/zoxasosobinofuvukot.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c25c5b6643---depavawigoliduvakunew.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/14m7h871ofdthgl4tppl68fv30/romukeludikotunixibusop.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/xejemiwofetimijinetin.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/34d1db5b06a49062e7b6a9dbacb00f0b/fafutipaxulowom.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/pezomakav.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/41822243930.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/85280529772.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/b1ga5jhiu7uosn45qtc01knah1/34781979003.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/wetitijilir.pdfIn PDF document text
    • http://thedreams.cz/files/33518028267.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b030754f073---80624624185.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/golodufetewoliwetedopos.pdfIn PDF document text
    • http://ciskmv.com/css/file/5690760673.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9F 2300 bytes
SHA-256: 9c228fe0078ce2e7a3233a14d9104bb24eef6cc92c116bb5f3f95e55ba4e785b
font_01_sfnt_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 20388 bytes
SHA-256: d9dabd2f5b29a08c1bffaea3fc9931919e903c7ef55622896936ca2f4c4b9d04
font_02_sfnt_off000117f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F1 10484 bytes
SHA-256: e08ae3a4283e77aa358eb961e81c8dd375951c9602ab34f647759fd3e66aeb9d
font_03_sfnt_off00012fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000147f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F1 17272 bytes
SHA-256: de589d072a362119f6767a3bc0d89e06e4b0847e179672c0f684efe6d5622e2b

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