Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf33b2692e51c35…

MALICIOUS

PDF

70.2 KB Created: 2021-09-11 16:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a65811b7edbf6c69de59839d8daba060 SHA-1: 2f49f77a8ab2678e43fbca4f62d87b8e3a29833b SHA-256: 9bf33b2692e51c3544703054edfeb17e2161a381ce42a5426ca84fd56241fea4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and compromised CMS upload links points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://irlanc.ru/uplcv?utm_term=lego+marvel+superheroes+android+apk PDF link annotation
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314af98d79e---venifolufaxak.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/wotizimupujud.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/wanorize.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/42071181146.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/xaxasokida.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/91764257871.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/64565006496.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cb7c2003a---givajubap.pdfIn PDF document text
    • http://seto.cz/uploads/gutogixevotopojovozapu.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/58061478754.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/77328492886.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/bizebunesovesu.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/98627196967.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/6c2991981bf1761306e4565f408103d0/mupuba.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/53f9a36b1fb2cf547b91b878b9b5aa4e/42891022001.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/46567954828.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/rixuxerorirawaza.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/280662240.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/17404243507.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613838c289305---12364660638.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/7238984038.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/jewujomonamagikafi.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_off0000b21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21A 10956 bytes
SHA-256: 4450d5eabb402ca710267f0bd19446f5b97fe527f16fd2d6c24e9a43ab93abfd
font_01_sfnt_off0000cb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 15892 bytes
SHA-256: 6f02371f600ee429611d75087fe6526369793a8637de710d9008cef0e7bc0a00