Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76bc581efe7a083…

MALICIOUS

PDF

76.9 KB Created: 2021-07-16 04:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 464888eaac0b64a1e930cb1c561242c3 SHA-1: 09ee13eb791c936f3531612da806210ab828b001 SHA-256: c76bc581efe7a0832ada22a50b0bf2c6c3d7bdb3f4058c10caceee63377de10c
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF's structure and embedded links indicate an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://kargo-box.com/uploads/files/64161132926.pdf In PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160ad00b54cafd---bikufeziwuvidururafakon.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/gawepevuferevila.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef72937fd---96376534418.pdfIn PDF document text
    • http://cooperclassof1970.com/clients/9656/File/88399232057.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/2d09e61e8c356546fbdbbf0070ff0ed8/28582389807.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/68ba975cb97cff6ea9231a83bebbcaff/3583867828.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/bivedum.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/jizavobiku.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/0a3dcaa17b072b9ddf246121a0554df4/64496371267.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/74136801831.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/58897670792.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/18817142899.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/volujuwipelome.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/46759300894.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/806731fb5b120abee194e10cc389fac4/mivavefi.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2671453669---sefagewajexefagebopolak.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/d534755592639d7cfda58c41e322aa44/61110125350.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/liposamanexedixaremobava.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd0d77570e---60791993094.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/bowibupaxisivoramaratopa.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/jomunorokuged.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f25ac7158---39471957494.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/89465560500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=thanks+for+watching+please+subscribe+my+channel+download+videoPDF 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_off0000c6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B3 16724 bytes
SHA-256: 7a0a7a170acf3c5148ac3c8aea554b2a1479dc1b64100c2bbc625e0f055147df
font_01_sfnt_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 11628 bytes
SHA-256: bef1f910dd61e26ca3d7bd48ceaad1701c6470d68b2d8915bdc7ea0442851ccf
font_02_sfnt_off00010d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1