Malicious PDF — malware analysis report

Static analysis result for SHA-256 b911e3c79ddeb712…

MALICIOUS

PDF

64.2 KB Created: 2021-06-23 23:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0292c6f6426339151c990eb093e35ca5 SHA-1: fa56cf1257d397b1d5d7dbc7a5eb88901b5431be SHA-256: b911e3c79ddeb71213543f2c0e7b81096d5cc95e955130062697b467740af7a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://engroupe.ca/aym_image/files/bitifivitogozafozejurefe.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609336bc72544---vofebadurus.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/1c0fc4d6fa415134b59f1a5d5afb9290/50290994074.pdf
    • https://zemiigori.com/uploads/file/40195325683.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3cb1dbc0a---zomazidegono.pdf
    • http://webursitet.org/Files/file/raralixusujawasejopajobox.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ostf56fiu2gn0ttmdg72n6bl76/65183432535.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/0000b7cb65ea5c584ad0307cf0358e6a/13928626644.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/17fecfa291028d8053503e0a32a16461/32391319310.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v08maun45u6pk2mafea5cgu7u3/48371981809.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/0dcfdaa9845bfd3fe0d41206dde2e287/tivimudarolona.pdf
    • http://botosani.ro/img/uploads/file/gezizixelidezitolugum.pdf
    • https://abeess.com/userfiles/file/92954723413.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=addition+and+subtraction+of+fractions+with+unlike+denominators+worksheets
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5a1.bin
8a9ceeac42235b8f7bc7e67b7b57a16fb3321739688d5bb9d84cd58c54d7746b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A1 5548 bytes
font_01_sfnt_off0000c865.bin
1b53e8f7d6502466ad0edf821a370b3f66fae22fccb096c368ede4565f69473c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC865 12084 bytes

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