Malicious PDF — malware analysis report

Static analysis result for SHA-256 479d841552d47081…

MALICIOUS

PDF

88.9 KB Created: 2021-09-20 11:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 33cd8d6bae0e4917b7562808fe78faac SHA-1: 88e51ca2bd6d9c577c7e9dc673bb60797624010a SHA-256: 479d841552d47081989bfab17896e7d6de8fba13231cc7192174d4c41775ea29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ksklinika.ru/ckfinder/userfiles/files/zefikogupidaxupatibegesal.pdf In PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210903_573A10976455EE47.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/59993899141.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/66273792380.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/45090413156.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/subalizuvi.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091202563125.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/84640637773.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/sebimoremosujiten.pdfIn PDF document text
    • http://capri.lt/userfiles/files/siwiworozarazaxogofefabe.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/71514642094.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/59482543706.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f502367485---40940096322.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/3ccb0160aa1ebc8640f3fb790d598a0e/11829665688.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/zogarodasugopome.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/10010015846.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/6137133ae687a.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/4309105841.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/66762489899.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/e85a6d72fb9fc1226fa6434d9a24e51a/63204286303.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/62870518724.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/45276259222.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/sowisibewamoxuratagis.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/62814271162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=shadow+fight+2+apk+free+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_off0000f76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76A 10980 bytes
SHA-256: a4c3f4de3cc019254d72d05a8acaecd11b475bd6f70563d0d0224c175a714e83
font_01_sfnt_off000110c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C5 17500 bytes
SHA-256: 55e999cae2fed2700176fccd1fe19371fffecf48b948b3bbdf78dec4d3dc21ee
font_02_sfnt_off00013dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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