Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5f6505dc639b17…

MALICIOUS

PDF

79.3 KB Created: 2021-08-27 09:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 620452a071db95da59c7ea99ba0572df SHA-1: 9097a937bb420af57939adbd49ca5321a848e46b SHA-256: 5a5f6505dc639b172ebae86aa275347b6a3f48f5e437f94c2838466f423dcebe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and is identified as a link farm, with numerous URLs pointing to potentially compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b1adb329a---12348740545.pdf In PDF document text
    • https://aqualibramontois.be/fckdownload/file/10731269947.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/ddc10cb08cc5216f83d4db162a7405ee/58686767153.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/37069084399.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/gubolafiwuxepijimuvomuwow.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/53964091513.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c0491319b---51213315028.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/fodigulanate.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/82307135570.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210804_171302.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/9295710751.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e92cf3502---bogumemuw.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087812c08952---gubitamomo.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/674894d1e5c7911ebe779f8e82bcd409/zodozad.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/aadcdc2fdf536bf40e45b62c125d3bb8/55978986498.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/xomolevikaloxupetofobiz.pdfIn PDF document text
    • http://traviet36.com/upload/files/51385679452.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/39510650960f459e6691d5.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/9ed4e7e2ff4079aa7b38e2b982060d50/56968890044.pdfIn PDF document text
    • https://fasleh.net/Files/files/bukip.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a23adb0dac0---rafox.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/32356788179.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/10579614620.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/8b5fb90776d1763e25f9e1570b2b9b9b/67414869354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=claude+brown+elementaryPDF 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_off0000d2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EE 16944 bytes
SHA-256: 27325538eb6b0d372f4acdeae68a40bb337df3b6ee09c3448d86471da6992135
font_01_sfnt_off0000fefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFD 10620 bytes
SHA-256: 1834d73802a60693215e9b83da12e2b27ee1b372ed16c67ca77be14b9953989c
font_02_sfnt_off00011754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1