Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4a8f1b61a63cff…

MALICIOUS

PDF

76.9 KB Created: 2021-07-27 17:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d77daa8b1076ecd89bf661cb2628d7ea SHA-1: 4d6c07da2b9aa74e2f3c6471ad2fcbda548e297c SHA-256: 7e4a8f1b61a63cffbf7b28994057c03ade4bd09277b9f748a05055f176a2c4f1
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing pages or other malicious content, a common tactic for SEO poisoning or distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://veterinarycarefoundation.org/userfiles/file/fivibipijaboloton.pdf In PDF document text
    • http://ikkosushi.com/uploads/files/dujifobejebalizi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/q90evbind0m54rdqbm947icnb7/79429678917.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f57bbc476a73ba48cb88f077c230fe8f/58477985325.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/32092103567.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079014198143---zokekavodunitolajokoxi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160830fc980278---28126808513.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/87118725299.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/282ecde2613ab8d15c77a173df117a0d/52731069500.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6c7e8afd97780e245a4e8b3980a7b2f/53440530877.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/rusen.pdfIn PDF document text
    • https://tigaintan.com/contents//files/30206529866.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/puwekarulonikudinedozotit.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/bakesanozurotex.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a0e0be1e3---39919819481.pdfIn PDF document text
    • http://elm3rad.com/file/85289946080.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23709672005.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47747109010.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/bcaf74ea8a7e79a446d96bc1cadcd9ef/93674416746.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d026cc4e---75767659237.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/kirup.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6aa0a1885---45891163355.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/8365986960.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/21039753401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=grade+10+biology+student+textbook+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_off0000c7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7ED 11432 bytes
SHA-256: 5050285a0bd0049eb781240e3695585fdc1c4013b15c5f74e865b8de8a75493c
font_01_sfnt_off0000e2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 16340 bytes
SHA-256: 9095d68c0ff31dc5e5e299ddc5730e5d398097e9330fe4c30f0415af56c007ff

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