Malicious PDF — malware analysis report

Static analysis result for SHA-256 5178cb887ecbd827…

MALICIOUS

PDF

92.8 KB Created: 2021-09-14 13:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c4ff1503e692c6146b12d0552f021a33 SHA-1: 0c8c63572ae56c7c532f0ba9ab3cc91e413a03cc SHA-256: 5178cb887ecbd827749ca0c39dc53563d728ae8c52629fb17854630520fe951e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://nhuaduongnhapkhauaz.info/upload/files/lobupaditimujiferaw.pdf In PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/kegemetanagofegezisixavan.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac1064a7d---81037905020.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d3f81137a---zovolajesiroxisulegavawa.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/47510553161.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/vadajewudepifesozux.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/98047550072.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/jarorezubegidi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1ee3571a---kumopafomedodaxo.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/69868326508.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/jijirukivuduwerexobimim.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/nadewamelix.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/pokibekoxuwipatusox.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/tuzizokiradapo.pdfIn PDF document text
    • http://pi-consulting.ch/download/dekaniju.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/10365417527.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/22850686145.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393854481bb---gawajafenudimanige.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/15609086817.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613c90fd54334---82514249773.pdfIn PDF document text
    • http://eternoohydro.com/d/files/8137812328.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/fc01fd82e5f1537b0967cab7a67f5622/fidurifamurebonelege.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/fubale.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/lugijowevuzexevufevafe.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/27289998915.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/03/81094409677.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/megoputabinefewiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=roblox+music+codes+2021+tik+tokPDF 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_off00010104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10104 10936 bytes
SHA-256: a543fc3cea5d864093f9867e636fbf5dea2eeeb19ca86802627f760b2c314421
font_01_sfnt_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 19232 bytes
SHA-256: 693c53edd3d0d0544b82e50db142e64379b724eebdc1084bea0316adfd0c7023
font_02_sfnt_off00014cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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