Malicious PDF — malware analysis report

Static analysis result for SHA-256 828a3159cf8770bb…

MALICIOUS

PDF

74.5 KB Created: 2021-09-07 23:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d11ffae9846c2d67b5c8695ce7eb106 SHA-1: e4943cb72bcbe1c407b831a352b2a80e010e989a SHA-256: 828a3159cf8770bb09525009174838cc7c09e51149bb942adc3485828af119fd
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised websites and disposable hosting, likely intended to redirect users to malicious content. The document body was unreadable, but the heuristic findings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998e2bad520---81139582282.pdf In PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826047a1415---durolawawilofofagopolozen.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c77456837---sedokovavuzininog.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210904015007-volexilulobu.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/30559190753.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/29a1e44731ef41ab6de00c06150dbb02/xixavisasujexifo.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/virawosalibokobe.pdfIn PDF document text
    • https://www.casestilistas.es//ckfinder/userfiles/files/81474834539.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/27010548698.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cdce7e9e0---reninedenif.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/q9j5a71hjmcat13ftst235qd81/86234540656.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/kodaropoje.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/81896594158.pdfIn PDF document text
    • https://deepex.hu/hirek/files/dusowovigiw.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/pulelevuporirobonemofireb.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/sefaxixijidir.pdfIn PDF document text
    • http://newworldss.com/uploads/file/rorimetobosonubugelas.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/gawogivogaduwepes.pdfIn PDF document text
    • http://jar-ted.pl/file/sijidakisonazonunaluwimi.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/rosuziwetoxusi.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b2cb8bb975a8c963962022dc74572f2f/kiromatexevif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=online+marathi+books+pdf+downloadPDF 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_off0000bbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE4 18672 bytes
SHA-256: be24f386c2e1b8601fc08f441f3732af42146bb897730aa326da315b23e334ad
font_01_sfnt_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 11108 bytes
SHA-256: d0a1fa0fd0b854b79614e33afaf3b8f3144af7c15884f48a6c58598bbf6d6639

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