Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c2aacd82605e99…

MALICIOUS

PDF

92.3 KB Created: 2021-06-28 06:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4912e977c484c1f530cf92ac39355f1a SHA-1: 6ee3bbfe6308542632b64d7dba3169aa5b1149d0 SHA-256: e8c2aacd82605e99499c3aecb6d188dc1ad25cb9df08952f23372a6fb2528a07
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/e8825371826ba9b289932642e720eb65/81048287219.pdf In PDF document text
    • http://asja-doll.ru/userfiles/file/kapam.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ba9c276e268b212358c66f9adccee118/zenubebanekakudufile.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d628132ec3---talakexumada.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/tibopilenoxopasexaratazu.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/lixazezodo.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/10301790287.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/e685545247607ba87679bd36de05dd73/79013170317.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/7mbs2802rj5a0pjtm9sq0av9hk/gonezokurepetowamelim.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afc47ee3532---22682650037.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/fcde62871d9078e9d6fe6ffb428083d2/97767120800.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc09e0b3e3---41382252052.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210605_184215.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784504c3bf9---74553088522.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceaa916885---duxexuvuleremax.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/vusumemigapexadus.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/4d8dd6579d169b5360634248b6c342fe/10756476540.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/9848446222.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/mamunoweborakeraf.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/fl2t9l9e445ir9jqaujnm31if9/81665534738.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c57be72a6---mixujonerudovazof.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/80529984298.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b033ddd5603cd5fbff7110b93c0d803d/dinajuvibukamo.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/34869963100.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/rubida.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/25691839871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=windows+fax+and+scan+multiple+pages+into+one+filePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 11144 bytes
SHA-256: 43c28d640ad4646e311c25f2015770befa0212daee180b441f620ab14e5125a0
font_01_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001206f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206F 17360 bytes
SHA-256: e302419635136416c7a983878359fb4779ffad1f8d7c724e13f21ad78a85475f
font_03_sfnt_off00014dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCA 16084 bytes
SHA-256: dae5038d748b2b7d89173d83a61ff0ceefc2856cc76f3bb6f5837745f88f8889

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