Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66493815d2e8661…

MALICIOUS

PDF

102.6 KB Created: 2021-07-20 22:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b36fadbfcbe2b7d31b9d9b8e576f5245 SHA-1: 90402921891103d34b978af0efba8e594a7ff8d7 SHA-256: e66493815d2e8661f0ea48cc37fc3305fcb5da21388e1ad0c7f7f450a027877e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://altinhediyeler.com/calisma2/files/uploads/jamuxibanujidibod.pdf In PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe63c97e78---lenaxabimevogovanefegefo.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e61671664e---72572490471.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/8c99060a33398d7062edf224e85bb092/72074546945.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/miginufuribuwi.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/94920341297.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/wanadekeluv.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/293180d5db7ea64537cdb7daedacbeb7/luponodipeziv.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3d290cbccde9864063e052ad61e5ab82/futofu.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/22064851181.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/714sb2vtglfn9a493ji3tjthpm/18191908781.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/51682438427.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/pezuj.pdfIn PDF document text
    • http://takemehometomatoes.com/ckfinder/userfiles/files/savozinusiworixojosi.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/7496275023.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/tokidiluxoxudakebe.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7005f3d44e---kusujumoworibusunuvabif.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/55209417606.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/zafomafov.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/guvemavuka.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608caaae4ab52---63011769836.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbf2875838---11284259042.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/foterobabasu.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/9aa97970eb0b94a62ff435a00149d981/basapexikilebabezuz.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0194f2602---xebivular.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/22008720016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=2020+vice+presidential+candidatesPDF 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_off00012e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E63 10600 bytes
SHA-256: 291bd2ce40ade90f228ba53d8bacac86dae6bf4764d084fb5bf84dbe9acb7113
font_01_sfnt_off000146c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C9 17564 bytes
SHA-256: 7673945b880003e168a727bb43c60b0a30f709033c92412c3cff5b4944b06274
font_02_sfnt_off000174a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1