Malicious PDF — malware analysis report

Static analysis result for SHA-256 7263633f26cc2589…

MALICIOUS

PDF

109.8 KB Created: 2021-06-29 02:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 54a6ff58fb327f0b0cb2141ea8238524 SHA-1: 3ac4e09e12f13940deb59cce1a7f468daffe0140 SHA-256: 7263633f26cc2589fe356ceed4ee0d5198b76745c2788df7e3c1f57e43c18b68
96 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous URLs pointing to compromised websites. The ML classifier strongly indicated maliciousness, and heuristics identified it as a link farm on disposable or compromised hosting. The embedded URLs are likely used to redirect users to malicious content or phishing sites, potentially as part of a broader attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://medvor.ru/uplcv?utm_term=six+sigma+in+educational+institutions PDF link annotation
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608db25590017---sepomukolera.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160987111eb049---kuvebiwafelek.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/zixafumupewijididili.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/nadasogazanufik.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fd25c4e1f1541860c329b54cfe9c4b4d/rasemufonadifijedemivon.pdfIn PDF document text
    • http://edelstar-mos.ru/files/rapetimonenemo.pdfIn PDF document text
    • http://deckdreams.com/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/rajawideviba.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/gerafifa.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/50450940262.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/dijikinevi.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc98311920---lepumen.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/56208877302.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050303354973499.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/medenodakoxuxerebidufukol.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/webukovu.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/77520420804.pdfIn PDF document text
    • https://le27.fr/docs/file/95747579951.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/1f4511179cfe653e7e0d5f0c0a816eed/5137928713.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/23340986046.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/a8a3cab23484bf15d885ba2870c46c99/jusafugufubavafuliz.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/a25rfv2frmofkipg4nd7bkkkm7/25564585111.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/simesisolekor.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087719c7e6ea---24919609202.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_off00014abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ABC 17824 bytes
SHA-256: 2f670ab59698ecc4ce3b4d47b12e46bde84543b02f0f9e7385245706381c146a
font_01_sfnt_off00017889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17889 10888 bytes
SHA-256: 55db7ffd02f229b12ab1209dcc16b866f34f0464999dec70ae86bef08445a25c
font_02_sfnt_off00019189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1