Malicious PDF — malware analysis report

Static analysis result for SHA-256 0572009ed0f17ad3…

MALICIOUS

PDF

70.7 KB Created: 2021-10-01 01:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d80a42bd7a989d0e11a0e07f1efd3e5c SHA-1: d433951f5ceccafbb68f3119f31aa782cd1a27c9 SHA-256: 0572009ed0f17ad32c3095b66009dbce11973a5cfa7aa4f9ce14159407d060a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://chcial.ru/uplcv?utm_term=alertdialog+in+kotlin PDF link annotation
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/kezax.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161480a9340b6c---levibatozeguvetawedad.pdfIn PDF document text
    • http://annabarons.lv/files/files/55932820000.pdfIn PDF document text
    • http://methese.com/upload/files/zorejozeluvugebex.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/xusuzomerowa.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7b841207f407e3489d43b06925fde1f2/gurigonuwivekosazugafa.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/91989360435.pdfIn PDF document text
    • http://dytac.hk/userfiles/kezokunepexebopigubapiwuf.pdfIn PDF document text
    • http://progetec.org/userfiles/files/xivavisaka.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/gopef.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/41460755678.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/74430845893.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/dc0980edea6b5a5bd441fdf3785dd66e/80882348406.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/kesosep.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/9844294857.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/12869433929.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/tefepa.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/59721665203.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630869820_1.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/wezonapekitujaretipa.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/11097218955.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/57132633732.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/65677615103.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/mefunijofadi.pdfIn PDF document text
    • https://superlitefan.com/uploads/files/27184661697.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/movomifatufelonufo.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_off0000b43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43E 10328 bytes
SHA-256: a5a87f3056110f1a23a469519f7c6b17800435321f8c99a9958ebb728ba3bcb6
font_01_sfnt_off0000cb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6B 16312 bytes
SHA-256: ff938e46021cc5971694253cc08e340912197a2fb8a88850ab92b98adb3fd31b
font_02_sfnt_off0000f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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