Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a4ec1eb7a0a041…

MALICIOUS

PDF

82.1 KB Created: 2021-06-25 12:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cefad10235083131adf2791da74fb44 SHA-1: 82cf8c4715f7ebdce481af0a6c93e531fc8ff398 SHA-256: 78a4ec1eb7a0a041217479361713c52a22dcd822f72b4f4bb454a6d6245237d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection as 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44ffa05a82---wafapariz.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7133d7737b---viponoxavopasatawub.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/74ib10u8cb5knteo27til7cqad/22519823049.pdf
    • https://creteservices.com/FCKeditor/userimages/file/pewotesebafuvejalurij.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/rt3on82uscblni2m71n462fplm/48127108987.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f6fc73e459933e51f00b066fc367a303/97072268266.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b45d04b2a1d---659866552.pdf
    • http://aarogyamedico.com/userfiles/file/66172788321.pdf
    • http://dyglas.com/userData/board/file/7818475277.pdf
    • http://fszhenjia.com/upfolder/e/files/20210601220120.pdf
    • http://thetsaban3watnuea.com/UserFiles/file/wimipikonovibilitol.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/3dc07c5cd8183ba9b1fc5b8e24da8bbc/2370931276.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877ee6d6f7d---jegoguvijo.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d18046ef1---zaxosejuzedudutojopib.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/5df2uk6jg10f47rbi8lt3ggjb4/66232279403.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14f538e05---7624373009.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=body+centered+cubic+example
    • 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_off0000df0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 16792 bytes
font_01_sfnt_off0000f71c.bin
dffa4f22668d5d81f1022735bdb44c3dcd12889f1877788ccfb91b2189720898		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 16660 bytes
font_02_sfnt_off00012272.bin
d09ab3689151ffb54a48123120c12754e4e084c0b37badf99f33d1fe533c8f85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12272 11016 bytes

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