Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca077c5b7f232e7…

MALICIOUS

PDF

80.8 KB Created: 2021-10-04 16:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4139b18b3de4ba19bdd4ffd089ee81f8 SHA-1: c44b64c9934b25a1b1bad651e939efd58dfb1143 SHA-256: cca077c5b7f232e77730ca413db93fc580fb85ae6e785b7aeab2179757b6b40c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://nomylo.ru/uplcv?utm_term=synology+ds211j+manual PDF link annotation
    • https://tranhtreo.com/images/ckeditor/files/xomivovakafuginagegezew.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/tojuzobese.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/tetoladupex.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161544096c00ed---91784808467.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d455183ff---kikasivuzos.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/dc7c620a16560fddbf96aff851aa2a9a/lurojosuramel.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/xegujile.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/bubivaf.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/motujosezitigepaxa.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/mudewafefogow.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/zanivulusutigerus.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/61366882930.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/kobukizor.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/xanodidigimupajenixeneke.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/62372047819.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/vujawuvasogex.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/rojavupinozuma.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/39203751027.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161506ac914c34---81925123552.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gotipovivetewazejab.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/jomafewemamurijosil.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/nesajukuxibaje.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/14418645193.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/43297374709.pdfIn PDF document text
    • http://paliukenas.lt/i/File/83331012331.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/22311356100.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_off0000d707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD707 17596 bytes
SHA-256: b7e157280a7525ae8007038fd8db5ef46ecb26881c621d4584e7fd9df2d55d3a
font_01_sfnt_off0001047d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 10760 bytes
SHA-256: ab97574653e32dedab609ccafd9804e8e0dc7b56739d23c6d62b85fbc7c6309b
font_02_sfnt_off00011d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.