Malicious PDF — malware analysis report

Static analysis result for SHA-256 7875b4b0cd6fe34a…

MALICIOUS

PDF

76.2 KB Created: 2021-09-18 13:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef1ed24b6df11590162e38bbabfdf4d8 SHA-1: e6d79cbb04d271c1eb85fce626d751e5c1d5ce68 SHA-256: 7875b4b0cd6fe34aa939a464b03f920ffc7b2609ed950f92cb4a465607e36b61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL farm are indicative of a phishing lure designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://grnca.org/img/files/files/98703878586.pdf In PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/43099509681.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a705cd1fd40dbaaaed4d5e14f56dbf29/jizuvolavubelupe.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/9116392197.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/38896134126.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/zulefonolavabopoxokomi.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/38214718609.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/zikezavuwajuwi.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/semadev.pdfIn PDF document text
    • http://netflor.pl/upload/File/49149120115.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/zalakabubexodonumuxelon.pdfIn PDF document text
    • https://migger.dk/userimages/file/kozusipozubomikunovixelex.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136f91976d12---38170611325.pdfIn PDF document text
    • https://austarpharma.com/upload/files/bogunowudikefumorule.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/37028906841.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/fevelikoderatepep.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/pakinet.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614048af18ab3---74023082701.pdfIn PDF document text
    • http://sartor.ru/upload/files/31210706987.pdfIn PDF document text
    • https://ibericadearmerias.com/file/48282052835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=imo+lite+2020+apkPDF 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_off0000c23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4D 19148 bytes
SHA-256: 31a25a70fa3a8000a9de8321726cbc29762b2579d38f88cd47862602436bbb71
font_02_sfnt_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 10328 bytes
SHA-256: baa5edcc6c96bc8bb1a5592606692b4a6a1e1405d708582a39f4e271c88c6985