Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bdc3d71f3774ab6…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 06:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a6f868e6e783a516bfebe1510a1f8705 SHA-1: 56470ce49976a1240deea4fd90fd4febce9472b3 SHA-256: 9bdc3d71f3774ab6265587993365bc9c536b5f028447db22cb7e8a84a929fc08
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/71463721855.pdf In PDF document text
    • https://ms2gacor.com/contents/files/vulitu.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/tiguru.pdfIn PDF document text
    • http://xfswchem.com/upload/files/34480413510.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/68901278291.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5829ef17e---zasejevisoz.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/7030988835.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/sorunibanovilukegufukufar.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613930133a94b---81012306351.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/13106893392.pdfIn PDF document text
    • http://esen.life/userfiles/file/zegumukifedosowojawitiza.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091206175452086.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/927088026.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7804f1bc8---tefujididenalelepa.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210904092700.pdfIn PDF document text
    • http://quranday.org/userfiles/file/84083760083.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/xoton.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/rovubigekemipodesosifefip.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/98985251176.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/84142729362.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/sofabuvogoniluzidi.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/tejitoxesoxivafizonanu.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/binifepenovutovufato.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/77801685737.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/pazosumutabefuwogiko.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/salulitixubijuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=angry+neighbor+outwitt+modPDF 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_off0000ce3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 20764 bytes
SHA-256: 214d1694ea061d851088366e0ea4ab95538f2054038fc887e908937862555a34
font_02_sfnt_off00011a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 10740 bytes
SHA-256: 314b2ecd9437dddb85505de00c61a2cddf8e482bd3be4932e65913ec82e6a556