Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2b53d610ae9416…

MALICIOUS

PDF

78.3 KB Created: 2021-09-09 07:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 983c73fd3e0fc32a8fea214617a32665 SHA-1: 82defeb3eb157c10d44d7c972823616562eb3b5d SHA-256: 3b2b53d610ae941610873b007082e232cd8bc96e1eff92a587bec66f9f78d8cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including a link farm hosted on compromised WordPress storage. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inijariku.com/ckfinder/userfiles/files/wewib.pdf In PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/6f8609b74799c966bbb6771a15025e2b/zezapufariwotoratowuwon.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/bomevew.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/subibodabojinesomosuxu.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/fubawogupop.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130588a6a761---56307821873.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210909/file/wibegetumik.pdfIn PDF document text
    • http://ilkemymm.com/image/files/67352232521.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/nusobewef.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/45066621531.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/248f85464901b62a556357b10646c56a/81050971985.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/40907669491.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/99721527096.pdfIn PDF document text
    • https://clinicscrm.com/img/files/piramufupabesumoju.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/62244080609.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/13392830868.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/68877106682.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/zenawakezeloge.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef50137e62---xigiwarakuvejukusamofenev.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2109060058308245001bdi1y.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/88421724538.pdfIn PDF document text
    • http://erictex.com/ufiles/files/89000881197.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/supovede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=kamen+rider+gaim+driver+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_off0000c91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91D 10452 bytes
SHA-256: a8d458071cedd66658012b64cbec324817b974a68d32e5bd0396dfb1f448809b
font_01_sfnt_off0000e085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF897 19508 bytes
SHA-256: c1dd9019159d48274afc83e49228f617f66bee38ceb9bc17f8bfcd5c71c8eda3