Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d96bf4c60847fc…

MALICIOUS

PDF

78.4 KB Created: 2021-07-17 22:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: af1e8c6e3656f896cbdd9ccfa5f4d714 SHA-1: affafd1d6066abc5766540459606544a41a36d83 SHA-256: b8d96bf4c60847fcb1e364e0a46739676a5b84a8a8a3c27dca621a4ab28c8753
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No specific scripts were extracted, but the presence of PDF_JS and the nature of the URLs point to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/p3gbt0gfrbs7708l9ire784mqh/temefusurofabak.pdf In PDF document text
    • https://tortugafilms.ca/adminfiles/file/kofure.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/75d3235ab79b288221409f7cf4497e86/75229824030.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/gadorixawokanux.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/40700158489.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ba5506c82---2591714513.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a217260dc---42709710344.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/sukevitexoluzonumopowi.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/21050237671.pdfIn PDF document text
    • http://hangquangauto.com/files/xasovefupibegupul.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/1127824043.pdfIn PDF document text
    • http://labsshop.com/d/files/xodelaxijelawikubol.pdfIn PDF document text
    • http://growourworld.com/clients/83159/File/7988122598.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4324baa03---3875479414.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4e99c3f2---refepaxudiruviweru.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/d428d16e0e3dbf29346c7e7237bdcebc/34777656693.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/53272545437.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608013e23e703---57953452682.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/19707559186.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/maxafefibu.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d069333ee---lapagixizalomuwuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=vat+relief+for+over+60PDF 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_off0000d251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 10260 bytes
SHA-256: 42256b837107d5c9078fb7682a6c3e58e15f5b8204246d922e84a3cd064b3f8a
font_02_sfnt_off000101a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 16604 bytes
SHA-256: dd23396a0c1937ef9fef9ad60667b688b4c9fc7bb8b05e90c601ff54ce4e220c

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