Malicious PDF — malware analysis report

Static analysis result for SHA-256 62104de4ba0fb5ed…

MALICIOUS

PDF

99.6 KB Created: 2021-09-13 08:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01d994fad4098cdfb447643262dcb5e2 SHA-1: 594e1d8ae66eb184744d3f7e11a563330411a6c0 SHA-256: 62104de4ba0fb5ed61dc010de329a0835ca019dfaaf05f8bf2387dcdbeb1d0b1
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple domains, several of which are hosted on compromised CMS upload storage or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/d13873773d6f2d8d2eb5e36b7af13b32/xusavobowozevixaz.pdf In PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/6726236105.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/12644329727.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/momudigavetif.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/zisokapupoxegiduwiges.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613008aa03bb8---vawunagi.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/duzufanusa.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/22524924020.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/40445342840.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/mosivatapozebenaroduvo.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/64076022191.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/15002659644.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/81152638281.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/63567308613.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/60076041107.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/fuvosup.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d14b976bb2---24747662280.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/32196319897.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/fowuvatitulorejufedu.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/mawawib.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/8317470727.pdfIn PDF document text
    • https://cape-electronics.com/media/file/86823238185.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/ruvumesab.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/tugofejojutezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+warren+buffett+way+pdf+downloadPDF 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_off00011c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C52 10740 bytes
SHA-256: 214b46bb580ff7059699c9c9e7dbab37b9b193dab0e145654544fbf45af7dc98
font_01_sfnt_off000134cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CB 20116 bytes
SHA-256: 53a2f7d4cae2af2614305800d7fdb6810afcef53a0ac5254379d39efaf89c03a
font_02_sfnt_off00016927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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