Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff4a4c3a1dcdb4c…

MALICIOUS

PDF

77.2 KB Created: 2021-09-02 03:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 5fa4c550ba63157bed7ae2c6d8ed7a21 SHA-1: f6d79c371f7e2897c94bd55f7b01c87e6449810e SHA-256: 4ff4a4c3a1dcdb4cca234e95f797b6397d9761de23c3b2c50fb5e7d92e524227
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=book+club+questions+daisy+jones+and+the+six PDF link annotation
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/fh8spkdj13gctqejusmh7ts6gn/rexilekerugewe.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/1352049178.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/7539424067.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/11020c60edfb2ac50ed57682d8882dfc/senapomugizepel.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/pn2h11kibnfuduvdu169iq8mg4/65272883426.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/12119582401.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/99058624556.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/50599971183.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/soranagajutim.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/fukubulajuxuxadokofevi.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/41082307162.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/ad8da46f98558f781ab226768edb7841/49185486945.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/97713433770.pdfIn PDF document text
    • http://willismctyeire.com/clients/c/cd/cd1fd5262213d36872a77bd42df049b7/File/bobela.pdfIn PDF document text
    • https://umartravel.com/files/87625075315.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/21k4q6ddj08ntieoecje91pa73/26874722481.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/af48974857d61fcd7fc48e1699ad3212/damukugowenuri.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ac861f8de---jolunupozu.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/kanixofuxixolusidomo.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/31970336472.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/65819513227.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/fumokopogogipudepud.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/35648526525.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/dca245bab089c6530c03f939cc5ed70c.pdfIn PDF document text
    • https://medtek.vn/storage/file/65141725132.pdfIn PDF document text
    • 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_off0000c906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC906 11244 bytes
SHA-256: 26523759176871fe1936aaedd46a585c97fc2e21601689c02294a2d9d1b96f2b
font_01_sfnt_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 16868 bytes
SHA-256: 00f8961b73003519a5d3e17f3060dbe7d2c56c948e5c71d4fbea25c702edd5d5
font_02_sfnt_off00010ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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