Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1ece5ebca827b5…

MALICIOUS

PDF

86.6 KB Created: 2021-09-07 09:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ee75d449c61e2a73d75ce9b4c5c2be6 SHA-1: 16e142b82e10c8dba1c4e81839cb3e62a4d76f60 SHA-256: df1ece5ebca827b52b9808586b7bd232091875a7b9af848c402c5bb9c4fc01c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm heuristics indicates an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://tfh-filter.hu/_user/file/bezipopupap.pdf In PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed8b070d9c---wodubagasaxibimiluzewoku.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607da2f4d03eb---18892609929.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/94316867686.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab005dabac---vebubiwabezosifuwu.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/bobezuxasa.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/703afc7ef9b7f1477535a851de1d43c9/98068769897.pdfIn PDF document text
    • http://isvpro.com/custom/files/jujoxapobozufinapoz.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/59598749929.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db8b303035e---lolisamelibulimajaxa.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e25de9e15265976f8cc44cfb01489b2/bemitugaxekojixu.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/a7981a7efb986c9152afbdb9fac25509/9639681177.pdfIn PDF document text
    • http://apart1day.ru/file/kuvarosa.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/3542889733.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/18630827566.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/zobinos.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079af02be0b9---32864046403.pdfIn PDF document text
    • http://heizler.hu/files/file/44970706282.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/riegbsv94k3ovinmelo8tuhq2f/53975176063.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/bekamodibeledodopet.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/79455564829.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/dazuximabufowebajin.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/94453e2aad13999dddabf61b200bc4d4/zoguxivemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=monostable+multivibrator+practical+pdfPDF 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_off0000ebd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 11080 bytes
SHA-256: 022c036d321887bc541ea2a2e52e97eff6c3ff84adef2b07ad7e0ccc71498af3
font_02_sfnt_off00011d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D86 18220 bytes
SHA-256: 39b6c6cf6b53dd6f60e3cd7b6e79213bf5a8e60bf3cf27fd479aaf1ef5eba478

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