Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8aa88885071dcf5…

MALICIOUS

PDF

77.8 KB Created: 2021-09-13 18:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b4c4668d45acf74b2594d7fc5508de1 SHA-1: cd8789f6bacf97a68e1de9addc367c3469f6aa19 SHA-256: c8aa88885071dcf5a9ca7abac6ce4dee657496981a14e60441da388e35147abe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external URIs pointing to potentially compromised websites. The PDF structure suggests it functions as a link farm, with many URLs designed to redirect users. While no scripts were explicitly extracted, the nature of the URLs and the detection as a phishing/trojan PDF indicates a malicious intent to lure users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=plant+vs+zombie+garden+warfare+apk PDF link annotation
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130d2f76e766---mobonurekebadosumaxupegi.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/lewaxawesegefavuloxexokak.pdfIn PDF document text
    • http://chinalabware.ru/d/files/94656227014.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/e030eaa05a7c19614b2ca98181b02fa0/kogapojapilazob.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cba4692955---sejikidas.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/fb2fe957086ab489e20fd33048feeac2/femukiguxaz.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/koragezutometasad.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/mojolanexenozuwed.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d09ecd6a---94044814478.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/wonavidipaliwokupesa.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/tq7ulvjbdqlksqiqg09flvioma/zewulovogovajiguboxukote.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/59433601292.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/60554470459.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/dagenupemutixonoruk.pdfIn PDF document text
    • http://goldmustang.ru/files/files/35913192101.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161364ff696e2e---32605576081.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135418264515---32371612480.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/65643234367.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/75256269267.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/xuxulokenawobapixenejat.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/liralito.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/vafujavafimuxaruli.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/gigebuworiwapoxubemizesal.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/34714703482.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/wijopebibu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161397a22328d9---66797524496.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_off0000c9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 17228 bytes
SHA-256: 829ded6b439bedadaa72791172e6586c824252a185331d6f90f5c785f3a9c163
font_01_sfnt_off0000f6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC3 11288 bytes
SHA-256: 85cb60d0282a4f439c20a593f0ed709de4bbac6b233af4eaf5b4fcd039802070