Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba962a406fe1806…

MALICIOUS

PDF

90.4 KB Created: 2021-09-14 09:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e6e58f21eaf356b4c1a0b0f1cfed678b SHA-1: 9eb7449759b85211fc59762b069ce71f0bd430e4 SHA-256: 7ba962a406fe18063cb28689ab14aecd38537b70a1e44529bfcf7a9a794e7186
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these link farms and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://kleiberit.ru/files/file/regafewedolaxenepefuti.pdf In PDF document text
    • https://hunghiephuylog.com/upload/files/34932981518.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/dekigujav.pdfIn PDF document text
    • https://efnnma.org/files/file/24880030786.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/62431991942.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/vuxiroxizogajovor.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb3bb03e04---31112337227.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/zinuvixodafajuro.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/kukunutexofidu.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/52988899038.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/20772040679.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161327e708ac93---16400789045.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/4826559949.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/zixaguvop.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/10897729784.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/luresunoxogu.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613474f55ca9a---fosajinifafomevomenu.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109132149238977.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/38360698686.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613647b2354d4---junem.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/76449294225.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/61219812832.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/c0c7da726d0ea01f0cfb54fe9e7237b9/xemun.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/90787015776.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16134ddaef357e---45435170801.pdfIn PDF document text
    • http://888chji.com/userfiles/files/38607525290.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/53090745721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=unturned+black+pants+idPDF 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_off0000fb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 17920 bytes
SHA-256: 32765b49661b1db546cb6be1dc24102ad65ed01dcca4a6978fc1781924789315
font_01_sfnt_off000129db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F2 10724 bytes
SHA-256: e8d07a0b896a9e551ab7493474f4e211fb909f155b67b1ab6dcab8645fe8db8d