Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6db96534263f043…

MALICIOUS

PDF

75.8 KB Created: 2021-09-03 23:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 13afb6f8a5157f9fe203c2f70abedefa SHA-1: 3667f5f36424bcb86c6e5297d9bb35a06f1f6bd2 SHA-256: c6db96534263f0430b7d7d8eab33880430fae087baee418511e0e6992dd16a40
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which appear to be hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'password-protected archive handoff' heuristic and a 'download button' lure indicates the document is designed to trick users into downloading a payload that is intentionally obfuscated. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://plentis.eu/ckfinder/userfiles/files/zuwidafudasesemarisi.pdf In PDF document text
    • https://kede.org/userfiles/file/12409447663.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/j34r1pm0j2kuspmo3rdqdtk46p/julajevozen.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/92226887976.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/sefefekozos.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/lajukum.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/91894250064.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/83318578649.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/wojusuzi.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/98779837373.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee77bf11057---xigitukedulapawajegexowa.pdfIn PDF document text
    • http://fedoro.ru/upload/file/sabezuvidotetidoji.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/sasowanokijufeg.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/24604088499.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a37bcd3f---puwutilixenepi.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f00630572dd---vupasumotutefijujotar.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/73823071694.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/zimuzabuwawa.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca7f537077---bakalirezegikujopof.pdfIn PDF document text
    • https://estoniapools.com/contents//files/ketenazumikaf.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609754cf4ee46---35383893169.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608087db5e4ac---44732103039.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/gejubobekixudaromejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+pdf+annotator+megaPDF 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_off0000c2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E0 10668 bytes
SHA-256: 1acabf322911d72963d89b41a38a91bfd0a68c42ae586dc7b6820fc1dd0f9566
font_01_sfnt_off0000db24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 17276 bytes
SHA-256: 27475418f14c9cb7be8ee1e97f609537d33935d262d055386e936fdfcd0f203c

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