Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5afec08003e1cf…

MALICIOUS

PDF

85.0 KB Created: 2021-07-07 15:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6df95a60c4b86bfd28372ea20af8c3e8 SHA-1: 4519763e691b45b9822bef3257a0c0dd2d960f5b SHA-256: ad5afec08003e1cf845a51e7799d6af838e2172d9e0795a14820a4b24703ab20
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users. The presence of a 'Password-protected archive handoff' heuristic strongly suggests the document is intended to trick the user into believing they need to decrypt or access a password-protected file, likely containing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://queure.ru/uplcv?utm_term=how+to+import+pst+file+in+outlook+2016 PDF link annotation
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/553459224b548f41af94b87622940588/36361315609.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/e7259d4a244ddd8e61ed7639d9d6fb67/18386015398.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/b0131a700cadaf2dd7dcd7a51611ce80/zebipewo.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6be0dc8e4---96592859885.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/27656258661.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/rubabupazomoletiju.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/66784478093.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/9mn2ca515ib2pt59eb4eufee43/85082666438.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160839440c9010---juvavujumobi.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/nidawor.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/15406200877.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d2f2966be6c7497800c12073c2a0a1f/movagakazo.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/julevapisedisa.pdfIn PDF document text
    • http://fitviewer.biz/files/file/47158160621.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/56979758995.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/02158514911255fb60869fc534e618ca/87867090281.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160940c0221d07---jopakefememojab.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/48063878952.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7c63605bb---bipapanujatafabel.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd2d0e1a57---sepotofitabokujava.pdfIn PDF document text
    • http://aawyx.com/sites/default/imageuser/file/76850427569.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/26069119990.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e85e42548ff4acd12f93f76bbcf4688b/ruzozo.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d979b410232---xiviwimu.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/18519249505.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e444fab759---50734898091.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB4 11088 bytes
SHA-256: 7deddda2176f4fbe6246b8dd281af1a019c497652e10f1731823284f5e68eef8
font_02_sfnt_off000118a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A7 16832 bytes
SHA-256: 78b9a6aea02da05dbd3d0894d7dd5f4867864eeea9c5b27f47a78bdb26cff047

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