Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa6a65a11fc8568…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 04:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2cd36873eab9cbbd5d18fc58b36f9dbc SHA-1: 759c3cd6cded7721581c1d70861b7cddfba91fef SHA-256: daa6a65a11fc85689eb7cee8538bca3aa883d47b661f56f278ab571cd4d35916
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicate a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to conceal its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://activepymes.com/pub/file/vuparof.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbfc2d46e7---91094551382.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/genekusagetelumovujenedeb.pdf
    • http://nfc.soo.jp/file/11428598429.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/9069ca26a54f836535af30a0ab0625a5/41786689573.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/4fc7d991cba40cf867a30491967c5c3f/52339751171.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1cfa0bb35---63077888518.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/xevanodewuvegu.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc532ee1d61---52984784562.pdf
    • http://lphs-the60s.com/clients/5/5a/5a84a5cabe7f31a06b4bf99f7e1b7ad6/File/gipirape.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9f20247f2---napajanutagidiret.pdf
    • http://lideparts.com/userfiles/file/1621460047.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/i4u0krbbti2ng0vejhbbp5v0c3/48737589860.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079544fd89f8---44262270403.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8c7bb3b66---13893114688.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10646af1b---53341679658.pdf
    • http://keralabiblesociety.com/fck_uploads/file/jimerazuwenowodagudedivez.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/qjdbco7uujhl9f6ne7h4shdt9o/vomoretudazisetigobigo.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160748f590dbdc---54373709179.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b589df95b79---8743389116.pdf
    • http://imhyuk.com/imhyukeditor/userfile/file/foguvedisefisupunire.pdf
    • http://peak-experience-japan.com/temabomaje.pdf
    • https://aashianarealty.com/file/lizobizijini.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+center+of+learning+worksheet+answers
    • 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_off0000eea5.bin
52519d28d3ccb3c60613686f353dbab98a447e2120a22911b185849795a8ac9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 16696 bytes
font_01_sfnt_off00011992.bin
d9d81ab4c064bd8bab53eff1a3153790c1c05b14508fd715e3a6c417c79e9062
pdf-font-stream PDF embedded font (sfnt) at offset 0x11992 10756 bytes
font_02_sfnt_off0001325c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1325C 16792 bytes