Malicious PDF — malware analysis report

Static analysis result for SHA-256 40dcd8c47d0c2ea0…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 18:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a96d06a33acd4ee39b70b9b70a829636 SHA-1: 4d00ca9c1dd768dddc007a6ecdab9108b3684a5e SHA-256: 40dcd8c47d0c2ea0e460a7d2b59b8f0f899a86052e0915283a29acc6cdc0571a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning model as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, many pointing to compromised CMS upload directories, suggest a link farm designed to redirect users to malicious sites. The file's structure and the presence of external links indicate it is likely used as a lure in a phishing campaign, potentially distributing further malware or leading to credential harvesting.

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://wastran.ru/uplcv?utm_term=ielts+general+writing+task+2+samples+band+9+pdf+download PDF link annotation
    • http://tractortools.cz/ckfinder/userfiles/files/13072599657.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/2dc9a657ae65d62366091f4dab536aa8/ruwijatapiribegovebutege.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b23c80bef1e---47195781978.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/74157391491.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/3a0785252738ccf21161e9a6c688b858/xuvupixegavesatoresira.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327124037e2---wolixatakunigikopexo.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/776221578.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/08/27/zumezavevivejaz.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202108181948212252.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/sufitijewonogalumamu.pdfIn PDF document text
    • http://abpaluso.com/upload/file/83195286000.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/22898933177.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/78027667444.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/db6be5fe813c01b9deb43b828b0bc5f4/553513532.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/wiwude.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d950b406a---22117882876.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/45099066834.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/kixigovatakolo.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b6e17e09d---bijolubifep.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/nccft9lv5rdavs63a1v53aust9/20537517702.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b832c8af4---89763218993.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16107ccf321b1c---46845379367.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/9249267179.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_off0000de6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6D 17068 bytes
SHA-256: 67c5265d94042e3beaadaa69cf6a0c6a85b4faf3b0362fb9f33b3d370a33014e
font_01_sfnt_off00010aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C6 11400 bytes
SHA-256: 6f5e5bd2f08c7f17277fc6dadb7844036c02d835fa272ccea89b6b8e83a1ce45

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