Malicious PDF — malware analysis report

Static analysis result for SHA-256 448602bd4886deb7…

MALICIOUS

PDF

81.4 KB Created: 2021-06-25 13:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b706c0ddc9036d663c6b73005f67f42 SHA-1: 905c2aa3bf06288dc58e2580a1281e9879493023 SHA-256: 448602bd4886deb719b0222864071baaf97b01c831efdf77ce822ff65b35607f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/aa6baa31df596c020987aee38fdf6c0c/sideropusodek.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/57864497295.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ef37a83fb---lidezogilimitezazovipa.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4d23e1c4c02f185aaa98ae37f018b06c/gafipopisegejekutabiv.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/fixirarixodubuj.pdf
    • http://alphaconsultinggroup.us/vpw/images/file/69443825920.pdf
    • http://zonweringnederland.com/ckfinder/userfiles/files/dorefor.pdf
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/2fff73ddea00c7de8ea7fc7492b5f68b/3018568329.pdf
    • http://buddhavehicle.com/userfiles/file/bonupefigomekare.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4d60acce4---88824322816.pdf
    • https://vansuloi.com/uploads/userfiles/file/65177848708.pdf
    • http://marymo.ru/uploads/files/13135176372.pdf
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/42208203442.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7ab876fcd---meligojiwef.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/1f41a2efbfbb974e56217d47ef7fdc77/libameluvisezoz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=oh+god+our+help+in+ages+past+our+hope+for+years+to+come
    • 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_off0000d9c3.bin
839c4fb66f27bacdb59d83b7e61fa7fe00cbcade1e39ff95c6414348f98217ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C3 11304 bytes
font_01_sfnt_off0000f405.bin
c746426382d8675bbd9ad6791a437459fb5e1f6cd53ab08aac1b96bd43650003		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 17012 bytes
font_02_sfnt_off00012063.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12063 16792 bytes

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