Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d6446599a15c8d…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 16:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd3a11ff07f406c83ad635de50084a42 SHA-1: cbb3b824244c364f8c51322721da13623054f3ef SHA-256: 82d6446599a15c8d0373e4ac972afecf9b4d0e0852eb427bc9b1de121df03fad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous embedded URLs that point to compromised websites. These links are likely intended to lure users into visiting malicious sites for phishing or to download further malware. No scripts were extracted, but the structure and URL patterns suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/cd56tlhlhg94aml6ipj7u35uu7/37538613199.pdf In PDF document text
    • http://artdealer.vn/upload/fckimagesfile/a5ec75e65d9663ddc7ff94e5980c90de.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/r62546513bs860jln9qorid6gr/71309660573.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126d94260fda---28512031947.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/93cf944057860b541539a91cbeac7717/39971263753.pdfIn PDF document text
    • https://activepymes.com/pub/file/kawevu.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/495fb16287a413c3f2abe91f10402e40/gilojoviwiposudavubuwe.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/gv5rttlr04b4rlants6qhuc695/87956753190.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/tagaxumo.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/vajiwefifinugobuwuxokaw.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/xuwiverorobopefeman.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160829e8fc0ba6---12757838523.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/mutamovoxak.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/39993653390.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b475d754b8---ripolorilelunasepow.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/78b745a3c53381f6f777621b3322cf2b/39400577576.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f6a9d28d---75504992523.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/zuwife.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e3d044b64---42862292889.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/webolimonamagesuluwoz.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdb1b15c63---67461247306.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829a1c12867---nesusiren.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/57132263785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=definite+indefinite+articles+pdfPDF 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_off0000e3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 10492 bytes
SHA-256: 0ee0dee66bb411cf758395bde7c71720e112ecfc84a9facbbfdd3946ac7f7aa5
font_01_sfnt_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D7 19068 bytes
SHA-256: 485e9f0f10f4aab3a32b98b8a1ed6afae7bfa6ec4f1acd88f91bed31d59190be

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