Malicious PDF — malware analysis report

Static analysis result for SHA-256 b962dda1307610ff…

MALICIOUS

PDF

77.5 KB Created: 2021-09-02 19:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8dfaeb5bbe19a25043fdc407e71d8d3c SHA-1: 91d8919ba37057763e767133852fba1075d89888 SHA-256: b962dda1307610ffd5b2572f0d6b727624220e49c66d60e2e0f3816c6b210777
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to lure users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://texmet.pl/userimages/file/65673793280.pdf In PDF document text
    • http://qzgj.cn/upload/file/migifunomutabex.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/fatiborajod.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/nukisubodoruka.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/nixozufetezajizodov.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0e8qikotlc4o3e0cbbvimphql7/judelogatef.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c2ef763d6e---tarib.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/37913321286.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/9c03d4cf37fd39c2287eb2eb2f145b54/jakunuvekenujedaleguf.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/n4ehnp0hj9sbdin0lc16uki6ud/60081911806.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609495e0d547f---vofazevixanit.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b330823f93f---37032901462.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/su7cq8ccspf9aton6s1da470eg/80672777336.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/pikivedalowebazotoxo.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/3526321616.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ec8a781bd---vovebage.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/2175461865.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/sutonugimejan.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/sozatawitotujedegijono.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2128b9285---wibixeliz.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/39857238411.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/todk47034jc3t86vougloom8a0/20454952873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=production+function+economics+pdfPDF 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_off0000d006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD006 10676 bytes
SHA-256: f60fca4a476a2b491f2f4a8b352baf072c63154c3f77838fe80133585f2ca195
font_01_sfnt_off0000e880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE880 15776 bytes
SHA-256: ea41131caf66deb9c1ec5045f441dd601d29e5bc7282797884099ecbd68e4a1a
font_02_sfnt_off00011086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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