Malicious PDF — malware analysis report

Static analysis result for SHA-256 1518bdf894045272…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 14:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a637b900f99ae79684c4f28b3930a8a0 SHA-1: 5864ce3e765c91aff25194ebe438fb2182710853 SHA-256: 1518bdf894045272633bb0e6bc325edfa69a8ee69c0a1c196bee39c601ae4264
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for distributing malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method used to bypass gateway security. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jobsandhi.com/uploaded_files/userfiles/files/tirevof.pdf In PDF document text
    • http://studiocinti.eu/userfiles/files/39831791481.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/23523521410.pdfIn PDF document text
    • http://bronia.org/userfiles/file/13096804883.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/69095981812.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/muburapox.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/waloluwo.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/vukazudonazurize.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130232428f88---tovudajoxakov.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/badikujajevenure.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/e96af0f2c678f7e24dd89910630b3d16/sesudofibenoluxivi.pdfIn PDF document text
    • http://evola.it/userfiles/files/godinedawekiwiriwogufafod.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/33920543805.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/82611118856.pdfIn PDF document text
    • https://mfdesign.hu/files/file/pivokofowitiraliredeliji.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/35886679499.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/rifonimudubupifimon.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/xemamerufirebudekofigimo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614050b46109a---46605241541.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/xawolarujunakik.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52032035556.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/vebopusotenuxiz.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/gedamoxenafopunivojigem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=android+emulator+cloud+freePDF 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_off0000e190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A7 10552 bytes
SHA-256: eb9dd346d5b9f2dbb31fac8fafb42864070b011b2fbc8ad3948b25bcb120e66d
font_02_sfnt_off000111ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 17848 bytes
SHA-256: 93ff00c6f1cc8dbfd29321fcf112d87c7ceb38045414eef177cd5e99712d3d43

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