Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45d90a3ffcc0d7c…

MALICIOUS

PDF

85.9 KB Created: 2021-09-09 13:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 26f4cb051df3249e88814c55150653d0 SHA-1: baaee1de93bc940c37c6106aa850b914de9ae141 SHA-256: c45d90a3ffcc0d7c7825ba4051eee6a0aae835061b9d32d1f25c02666645186d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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 http://rancholasmonturaspremios.com/campannas/file/miboboveriragizixikufojew.pdf In PDF document text
    • http://av-jet.ru/userfiles/file/dojeloloxomapofokik.pdfIn PDF document text
    • http://vhshf.de/File/logigimelepevawug.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/24641546217.pdfIn PDF document text
    • http://jinyezi.cn/upload/gomivojalidiwasopi.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/24048658958.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/23481316322.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/mipedoxotunifu.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/51612760609.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109070700108094.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/bivadojobemifivikeza.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/53030410128.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/41358481652.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/80117044476.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210908_BFDFD6267D82EC9A.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135aeefaffc8---71716699899.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161306585302cf---lazagupuwe.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/3552089193.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090307510873499.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/nanewedurineweva.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/sotezawigolesitudupi.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20016244437.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/13531113372.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/f0077b375c85c43f382718926bfea62c/95067602796.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/24959470292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cast+from+android+phone+to+tvPDF 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_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10191 10812 bytes
SHA-256: 79f7c38c7f2939b4e6b73c0beaa859e347d990e37f52836c02330def8ad1c3ea
font_02_sfnt_off00011a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A51 18112 bytes
SHA-256: 8422e9f2ef6e854db43c4361834183c332364f19ed2712c5ef6af476edeb3da3

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