Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e384e31f255afb…

MALICIOUS

PDF

83.5 KB Created: 2021-10-04 17:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d1cda3d6cf0bf435638cccf4ae2f6614 SHA-1: 44b229d2d5a8fbbeab8030764fa4c9ebe563071f SHA-256: 63e384e31f255afbc2437acf9322f87a37805e498844814494fb386783e520c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution intent. It contains numerous links to external PDFs hosted on compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly suggest it's used to lure users into downloading further malicious payloads or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://ketchas.ru/uplcv?utm_term=have+no+words+to+say PDF link annotation
    • http://gachbinhduong.com/upload/file/9116392197.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kiithto2sgj1gh03g82f586iv8/ribunepefogekek.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210918222902.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/36595462415.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/lerevifufenuditur.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/ninuxolelogifefedakome.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/28655826372.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/53062525327.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/serofajuzodininimukekigit.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140297dc5db2---soxodemoradebubibi.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f717e09465---94291572489.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/45276488989.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/talanetemupozoge.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/21120758726.pdfIn PDF document text
    • https://mu3yc792xh-rl1.com/contents/files/mokirorudominegasude.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/91152236422.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/xudaxepapot.pdfIn PDF document text
    • https://dol-rtknetwork.com/uploads/files/74196822295.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/duvowaxoxajo.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/jowokexulopujanokemet.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/65427716072.pdfIn PDF document text
    • https://jensbrode.de/files/file/99397722648.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/butijevedataxa.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/jufipegewunuvonepulujaf.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/28574183321.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/23600377219.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_off0000dfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 19204 bytes
SHA-256: b5ca7459b664962892b3a7d1aaf509f3e69b912dd46792524ccb6184ec4bc334
font_01_sfnt_off00011135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001294c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294C 10360 bytes
SHA-256: 20e789a703a31a48b7155ea36c5e6d8cd24553f6afacd93d1a6e42d9a1e98fc0

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