Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2536530d38d166…

MALICIOUS

PDF

72.6 KB Created: 2021-09-19 04:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b066112c1f7e71615e7d2ffecf9111c SHA-1: c134d16d7e75286cb1a13175def1ee5c2307ce2e SHA-256: 9a2536530d38d166c90f0f49df5f7ef35dc1222b259c5d3cf379f24832a843f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of embedded JavaScript and numerous external URIs pointing to compromised or disposable hosting suggests an attempt to redirect users to malicious sites. The primary attack pattern involves a link farm designed to obscure the true destination and potentially distribute further malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16136a9eb6a441---51165363725.pdf In PDF document text
    • http://cybernet-ap.com/UserFiles/File/51845650743.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/kuvolopexosadudunujuvusex.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16146892f40b54---13382499542.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/31922267948.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/banetibevotap.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/wodukewoku.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161313c93c989b---86418261612.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d04d246f0---gupedelikazewexowi.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/mozokimesagusuritejabebom.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/ziredabuxirubogafo.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/13101694769.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53266ea5f---89759366681.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/vofanijugutav.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/55510104466.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/tupesetomoworanulun.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/japiderimiwesurafosozibej.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/jonapuzejibugif.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/tugawur.pdfIn PDF document text
    • http://esistore.be/userfiles/file/99395722817.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161455364d260b---68023281930.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/98109701468.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140839bd6c9c---97564505467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=surname+is+last+namePDF 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_off0000ba40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD252 16912 bytes
SHA-256: 1a59673e098f00a7adbefa8a3aff827cafe44e7c5316592907b989b3dc524885
font_02_sfnt_off0000fdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 10324 bytes
SHA-256: 8dc76f18b5f9c2bf110ab3461ecc7ae211e50675449277ae601eb6c0a99bb5d2

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