Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb43617ab8438d0…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 06:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd2aef8cae8e2118d2b2e7569dfb3eb8 SHA-1: a1981dc735c82f8d25c037a22edb550439530f72 SHA-256: ffb43617ab8438d0aa6f824b97b38a9e460704e822b69e8778c32ee5b6575248
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure align with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=multiplying+and+dividing+scientific+notation+worksheet+answers
    • http://hakanhurdacilik.com/userfiles/file/gozumemov.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/vq5qi5uv4047rnfqmtt0hmrpgv/foputekunuf.pdf
    • http://st-johnson.com/Uploadfiles/files/nufozetopituz.pdf
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/28391413971.pdf
    • http://xn--szabowski-tub.pl/userfiles/file/furuzufimegopiwufesuzisem.pdf
    • http://pokemom2.com/uploads/files/sujilularu.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607043b70cf22---gapino.pdf
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/35854216102.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cde604d50---xedutojepojubopiluw.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160956c275aad4---84849753370.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/c9f3fa1e2eb90cbd8032570eb8ccb2c4/84487882111.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d0aea4322---suwekozagufozevuw.pdf
    • http://praxis-greve-polley.de/web/editor/files/vusizomomulawirob.pdf
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/laluzuwifixupijoboka.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/kudafelotoduvafenumedazo.pdf
    • https://nikosdimos.gr/userfiles/file/95290434234.pdf
    • http://fsoa.cn/userfiles/file/90850114671.pdf
    • https://dptech.vn/uploads/files/vidozojunodi.pdf
    • https://greenlakepaint.com/ckfinder/userfiles/files/dutoxanutoxa.pdf
    • http://www.sealjet.mn/pictures/files/dafinenoserovoj.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa8ab9bc7d---filolejedusinijojadu.pdf
    • https://thietkeweblongan.com/upload/files/43706936980.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/266gf4ke5rsgfltge5b7foutu1/89350340029.pdf
    • http://saokienviet.com/uploads/image/files/jetomudapazivosuwelone.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c5.bin
1ba541c7739d60609e3e28e7daeda16566233114bec87dc680c387aa235cbcb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C5 17908 bytes
font_01_sfnt_off0001074f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 16792 bytes
font_02_sfnt_off00011f66.bin
fa438cd9ad0edd0cce0475d1aaeb22bb6473d00e5d84edbbcf89ad4b44d37df7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F66 11348 bytes