Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28466c8333048c4…

MALICIOUS

PDF

75.2 KB Created: 2021-09-08 19:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da7fef7f36cb327ae833811b23a3f0be SHA-1: 12b9a12d91f57a3d43ad57524f5ddbc0f266f495 SHA-256: b28466c8333048c409474187438ee8b8a5fe2249ed18e146561cda9bc102485f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mai-avto.ru/upload_files/file/wulunupe.pdf In PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/vovigojebigodakafufep.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/lojidalesiwisevetoki.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/zumuvunugonezekoritileb.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/jimakedin.pdfIn PDF document text
    • http://kco.su/userfiles/file/sepuwula.pdfIn PDF document text
    • https://majubesar.info/contents/files/luvevekuwanederasalebo.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/susimatok.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613113d1a2b7c---79133144895.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/35400443918.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/79564719087.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/43677046199.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/92267331189.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613653efab744---61973269405.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/jusesujokanufaxosewe.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/22f3da9bd40ebc0e30de76d7d6f5ecc0/gokarixedegemizoxegaza.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/94327374845.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/98812002841.pdfIn PDF document text
    • https://tigaintan.com/contents/files/26990260550.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/boxitawikanaduvom.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/25052154565.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/36721971720.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/dc720d6c867492af5073206f5e00e72f/8682220405.pdfIn PDF document text
    • https://pellevah.com/upload/files/89203913616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=electrical+instrumentation+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_off0000bf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF78 17648 bytes
SHA-256: b63ab46971b7b58d7f897787d1ff2b1f919f137a62d3ba1ed67e76ff77d89964
font_01_sfnt_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 10948 bytes
SHA-256: 33b9a0164fe37af469991dcd770ac5a277754bb2044e2b2ecbe021ffe59a191f
font_02_sfnt_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1