Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a7cbee92fb4c78…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 14:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c5d196e40cff3d2e9a4f58e3c4c63aeb SHA-1: 5766529110fb07285c5a3c1059f7aff61ea66be9 SHA-256: 86a7cbee92fb4c78fae7037f6323faa4edbc9e38509893f9e109ea73c65a294e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as malicious, including a link farm on disposable hosting and a compromised CMS upload. The embedded URLs suggest an attempt to redirect users to phishing or malware sites. Although no scripts were explicitly extracted, the nature of the link farm and the ClamAV detection indicate a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=minuet+in+g+major+violin+pdf PDF link annotation
    • http://munnarinfo.in/userfiles/file/jupadeluzedajige.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/76665789921.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf77b01a15---vebilivozis.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/23370628883.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/27828252344.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f0bc306b---dutibedonijobetozaw.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/a55bba13e5253256632e5a32af9f094b/nodoruwazu.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/zuxefepujawu.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/12674096956.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/xuramorabezumunot.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/69787794600.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/gasunuruvujonot.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/c48b7e304ec807e6b9489548563b5854/maxewibitine.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/91641436683.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/aro3jmcaj8tplof3g41taec610/nivujigejonir.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/fojatun.pdfIn PDF document text
    • http://voijin.com/userfiles/files/xijesuloxuwumibotit.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/kiraj.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749b4f5c484---95617786514.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/kojasubo.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22064004248.pdfIn PDF document text
    • http://htcable.cn/d/files/retunine.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/92932025348.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5ae4b311ed---39708712095.pdfIn PDF document text
    • 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_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 19824 bytes
SHA-256: 40f524ad0bd5db787612bbb607b589d7633aed0766cd3f1b2f770f5610cc6837
font_01_sfnt_off0001146e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C85 10960 bytes
SHA-256: 08f625b8d407c1b7043b23cf0e9e637a05969a1632e2536b3b9840da22a9014a

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