Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ca2b0a6db3de0d…

MALICIOUS

PDF

74.0 KB Created: 2021-09-23 21:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f52dfaa91cabc66499837ad0bf2a2d4c SHA-1: b2e870551d23a37051eae72f7e5eb751d2c29d94 SHA-256: c4ca2b0a6db3de0d99c5813b11c89abdf81433abcd3935c2db5999362fb1374b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=toca+hair+salon+4+unlocked PDF link annotation
    • https://eltdb.com/UserFiles/files/6288377572.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/vimewikosebudawil.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/xuwatanakakikuzibomoru.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/27738553837.pdfIn PDF document text
    • http://intertribo.sk/files/gejipumemadenivinamow.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/zasilolajeki.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/19739708773.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147dadb92f22---jibubal.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210909175513.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/40990636758.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/mizagijiwizet.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/mulujerabujasodilobebika.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/xizakiwujalakirolol.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8531034d0888da2bb9386306ad4f46f0/sananofuruborumodudow.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/91669029287.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/64609246252.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134d822989b8---loxilulifod.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/moliwonawopewibefunofa.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/34597090904.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/10361756306.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/89799531486.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sipifetokilofinavivobeve.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/82714702375.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_off0000bc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46E 10600 bytes
SHA-256: a95607e7eac6f8656f009d49639ff5dfac298efa2a4c6a5d5ce3548361304ea0
font_02_sfnt_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 18144 bytes
SHA-256: 686a71b33a01e90d47a104c4b7e077e27602fe22e58ca05128e53a4b034ec973