Malicious PDF — malware analysis report

Static analysis result for SHA-256 819039966eeb10d2…

MALICIOUS

PDF

160.6 KB Created: 2021-08-10 13:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d34cd0438d9d2073df4f41aba5ecdf35 SHA-1: 2b6b30ee58b5c80921ce8e4a58b487a5af0bf04d SHA-256: 819039966eeb10d24a9fcaac35f8452a7814a4f3cc37a07bcd004853c31e20d9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, which act as a link farm. These links likely serve to obscure the true malicious destination and distribute the payload. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b67f901420---lirazejedeganad.pdf In PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/pigolefipixagir.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/bizimuw.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/e8ecbf5e40392bc9b2b1031ff69c971e/sosunadukafub.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/59967361593.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b34cb9db---23562128960.pdfIn PDF document text
    • https://andrejc.si/files/file/xupikiwunum.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f05804b2d8---sijutidarujuwamu.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607276905e97d---moxaletupesafezuzawu.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/20326791365.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ab2bb5b14---koxujoxeme.pdfIn PDF document text
    • http://gardatrans.com/content/Files/lenizukas.pdfIn PDF document text
    • https://irantruck.ir/data/file/vikad.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087febd0b2b6---rafolegipuxeza.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089b1a482c87---luninuzajebu.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/mutagonarinuluxugi.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/mobinekagiwodewesitenuv.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/a88a65306d667774d4f0dfe811650fc6/1734066903.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/60632979020.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/bowexoxusepokoju.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/pimujuloxenuroviwagesixir.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/wezemejavusamemajake.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/f420c6c81e8a0e427d8f4750f06f6c6f/99508242873.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/0gb0dko1lkd3oanu9c1fntc66a/bozotinubavagifokakuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+is+found+in+a+formal+strategic+communication+business+plan+or+reportPDF 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_off000212fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x212FD 17752 bytes
SHA-256: e3feb3351231132455312124d1f6378e79c557c55e843e9ed0e763b0231a8800
font_01_sfnt_off000240e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x240E1 11300 bytes
SHA-256: d5193705818e14607c6dc0a13296c139df88d6f2a58c234cbf5ca3afb1562e8b
font_02_sfnt_off00025ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25AD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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