Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c5ad4c9b8c1d69…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 15:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 02a44329a13ee470c4bf793c850537b2 SHA-1: 5c03fc36d52f241dd367828987903842d81f7ec3 SHA-256: c6c5ad4c9b8c1d69d213ea3a3f312a465d55433d0df6c44a496991a9bbeb589f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting, suggesting an attempt to distribute further malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maconlux.ovh/userfiles/files/fufowizivusiz.pdf In PDF document text
    • http://fleshlight-tw.com/userfiles/file/81096682906.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/81122269273.pdfIn PDF document text
    • http://bakoca.hu/files/file/57602591421.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/raruwu.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/rizupomevanu.pdfIn PDF document text
    • http://sns.hu/_user/file/jemos.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/47226075979.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/7354635809.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/rawelotoramilorub.pdfIn PDF document text
    • http://salwex.hu/file/51998415940.pdfIn PDF document text
    • https://ip-pharma.net/data/files/suvujesipinar.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109020337477443.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/60005344150.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/mijoruniwutaxudoloko.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/vevikesi.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c57f688a2bb76550f7f5a69b687cfc94/83383532379.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/61997745529.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d028312323---votofupevifazusefib.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/d6293ecf73a70a94dc64902b0b93d2fb/gadovanis.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/xenujo.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210902063350.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/23498658234.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/24535704115.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/kosawatavasaxusaj.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ded3a56e13---24573558773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=out+of+time+full+movie+free+onlinePDF 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_off0000d104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 18152 bytes
SHA-256: bb8b9eab40c5359543823f9231773811081a0d866858227e3d54bac2e6e2ade0
font_02_sfnt_off000118d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D8 10236 bytes
SHA-256: e87d18c557cf98dcf8b446644c9ee00553c19b6e2fe6ca14974125cc7f58b848

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