Malicious PDF — malware analysis report

Static analysis result for SHA-256 32efb7c1abb2bf40…

MALICIOUS

PDF

77.3 KB Created: 2021-09-21 21:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8178bee864d1339c5eff03102d515f85 SHA-1: e7c29c0f2a5585a64a0523813abd8428e6ec0669 SHA-256: 32efb7c1abb2bf404ba887863bca5f2568dd794b5ff6bff1bb443627d5c409f5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://megatekspb.ru/sites/default/files/uploads/78538737285.pdf In PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/bd8bsuacb6rdq47v177rmpkss0/78322037916.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/82047196583.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/bizok.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/wilet.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109090659553119.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614958d8067ba---gebagukewimukugexajuwu.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee09502ac9---mometugevifafutim.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161446ff280588---mapax.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/nozefes.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/bevas.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/47455276803.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/xekusow.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/598587e0e01cc753585d10910b9719c1/8715308014.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/17941327700.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145c56e7be00---40684121711.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/sunagosikutega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ayyappanum+koshiyum+torrentPDF 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_off0000caa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA5 17528 bytes
SHA-256: 99fea1105856b55bcc95dbecf6421fbfac5efe4b1fe45fa10ce9f829747d40a7
font_01_sfnt_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 10756 bytes
SHA-256: 6b40d78f3423441df46392be4de9165a876a991a459e1885a52fdfa5596243a5
font_02_sfnt_off0001107e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1