Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92990c7d8439cef…

MALICIOUS

PDF

74.7 KB Created: 2021-10-09 06:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a0946e420f149a9cb499e70077301ba9 SHA-1: f8aa9c3a03442402d1dd4d936e1fd782e28da155 SHA-256: d92990c7d8439cef322982e6d478f76c28f8533ae7f7f10d5c451d007090985e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of multiple links pointing to compromised WordPress sites and other disposable hosting suggests a link farm designed to distribute malware or lead users to phishing sites. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://shinhwacar.com/userData/board/file/betininitoxoledu.pdf In PDF document text
    • https://dcimx.com/files/konipajarodibemi.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/56021658246.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158107f8e761---67876913348.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/76959103012.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/34644238965.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/2586973012.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614573de2d377---5560247058.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/84219845696.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/jtu1t90um18fii83n29u8faade/dokawezuk.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/tofiramapudonofomaki.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145456d101be---nixagurezozazepulila.pdfIn PDF document text
    • http://mdcegy.com/app/webroot/img/fck/file/43135343910.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/tazalekozudonexolevasoti.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/mozujigudanen.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/15692324929.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/xepupijilanesegupejorino.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/63117728082.pdfIn PDF document text
    • http://rideco.hu/upload/file/61632426588.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16152a41fad8fa---gelelirefe.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a6b5ee469---puzolofitufemi.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161519ef281b8e---91305283195.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/salopamozademonarovurut.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/fofitavapisaboluxutolul.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/wibojabonajaloma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=all+cheat+in+mobile+legendsPDF 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_off0000c317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC317 10836 bytes
SHA-256: 89e2e6316691261251ccf879db54279bbede2991eb7ddb227fe7aac5c138473e
font_01_sfnt_off0000dbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAD 16232 bytes
SHA-256: 7f8c44f27565c73dd766269b0f236fec88629d60da1476aab3167a856557cafa
font_02_sfnt_off00010504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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