Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a3c447c82e5070…

MALICIOUS

PDF

83.3 KB Created: 2021-06-29 04:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25ef8362e9ebb76660047700621c4a7e SHA-1: 3b14b4921b0b799491b9104cec6e8bcd020e9df7 SHA-256: e3a3c447c82e50704a1b279fae1608b94f564cde24de14258bec440354edb8f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/3499e5280436bb76c16cb527e9782d81/pokepafibipa.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4b9ac9b39d01c712f24c4225dbda5761/29440406492.pdf
    • http://notarbrazda.cz/userfiles/file/82450038263.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c81a5528f---gusanebuvosone.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c24a7caed0---19661081960.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16070505fc8f1f---pasovupawubelogabupaw.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2dd5dd358---rekiwe.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae91e91a6f6---50472078484.pdf
    • http://absolutelyneon.com/userfiles/file/6776143879.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac40ed819bd---19298614718.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/f7b75276f44c9701028a56e9bb51de0f/nozomiliniwexoxolowavab.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/917u1h5gbl01pubmj0bkls1bp2/kafekomepabefafasosuvogif.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/b0fad72695b7ffb5bc7c2d8d8625ee36/47384176568.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/f41f7968546cd8ab536b66b702ec4934/82666166439.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/00a434fb79b7a7ab0bed3dcafba1def6/38570497250.pdf
    • http://pcwenhua.com/uploadimg/file/1622890687302434940.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9f8fc6995---77974858324.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/nqggkbvcljd9mn097ncrlc7ji6/wudomafexirozokuvutalux.pdf
    • http://artecgroupservices.com/imagenes/file/xalojuwanatexazabagu.pdf
    • http://perles-del-beya.com/userfiles/file/40977054288.pdf
    • http://fsoa.cn/userfiles/file/8544885787.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=removal+of+tonsils+privately+cost
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e261.bin
bba74233867f95ed96dce64336347584698cf45d71449b2de0bc35b2ee34dc9c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 10868 bytes
font_01_sfnt_off0000fb8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 16792 bytes
font_02_sfnt_off0001139f.bin
b2fa3926c64b03c4d5ac2f640650a6b0673521c4e89e3606c690fb04e9641515
pdf-font-stream PDF embedded font (sfnt) at offset 0x1139F 16988 bytes