Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4ab7c0ec6086fa…

MALICIOUS

PDF

77.0 KB Created: 2021-08-28 06:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8ab9564e011d2b60796f05a6d8b5306 SHA-1: 4f032bfce555a5014c390c62915377837bc44b5b SHA-256: cc4ab7c0ec6086fabd4b6b6b143447c221255466dc5c5b2f160adca4935b7f11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF is a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content. Although no scripts were explicitly extracted, the PDF format often utilizes JavaScript for malicious actions, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://novussiteyonetimi.com/uploads/file/serutoguvubemimowewu.pdf In PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/06/19/1713544218.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/41616835406.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/up4pe2dcmfo25u1duf3ku3d1l0/47013808382.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/zaxumuzubikofofu.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a936900163---rupogawuxip.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7bbed8e73---34358745268.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/e1191ae6301341ebbe205bd3091d8530/bedag.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd51404ae3eb5256198b4a6e58503f99/sujidokimipivozevisaxe.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/34267571629.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/bd104e347301a89fb0af7e815d815824/vevuvusaxiworikinegi.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/12053996549.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/fdd1f173a6afdd73d321e399edc8d30b/83537695352.pdfIn PDF document text
    • https://asi-filter.pl/files/file/72954901201.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/37971831857.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/hin5db27cdg80cu35lk3jahin3/77686632173.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/7d996d9d3d99907f3e7f601dbefb6054/30426780094.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/b04vjvul44pfnu1t3h3mb6nhg2/joguw.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5fed5d466---90968896916.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/77371742453.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/873ad522c80f06cce66801608e5c007d/62725837685.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/34356821471.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/16qvcdgukjro0faa4ura4csr53/89920094987.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/relojakutijino.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/39157385479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=parts+of+the+plant+functionsPDF 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_off0000cad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD3 16360 bytes
SHA-256: fc58ba975fcc2fd7ca69ea7610dec4193d57a4c223be28a61d0ab6492ab89ec0
font_01_sfnt_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 10676 bytes
SHA-256: 92dbcd42736974dad167da8c119f14bbfddd2f05f7791cf591a85a41fed11327
font_02_sfnt_off00010d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1