Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1c678b2b5d5173…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 14:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 95a34b11605c71d5ced02bba4c85157e SHA-1: cb91e28d8e59da33788a8554741a1a4c21316d48 SHA-256: 5b1c678b2b5d51735b8d4d07c3f8badc5ef1b190d98dfeda7ebaae5f1e15f510
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of link farms hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pixomot.ru/uplcv?utm_term=kingdom+rush+frontiers+mod+apk+android+1 PDF link annotation
    • http://onthebroadway.com/CPD/adminpanel/upload/file/95045996032.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/71636284413.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/80149221994.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/nmp37atn0iafeprhb34iod6253/34928430506.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/9511795340.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/vumulewakobet.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/61170020921.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/42394934745.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/sarunelabikogujabuloneret.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613791faa6298---wuxirewuxuvinuwu.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/35a1a0af1c8c6f29108b13dd3e49fc0e/lipiz.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/rotiwudivuruza.pdfIn PDF document text
    • http://szm.hu/userfiles/file/98862079072.pdfIn PDF document text
    • http://fpole.ru/sadm_files/55332971744.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/22993699018.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lfsp6qrrcvk2k894r9sghork86/jiwuv.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/29904984594.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/lexofunomasabumuxazo.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/kerolaxulafebusit.pdfIn PDF document text
    • http://djpress.pl/Image/files/42276968933.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/81881589170.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161391d3a21d57---76465442112.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/20877834478.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131099cbc5df---vabakaxawilowojob.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/3600221046.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/lujizoba.pdfIn PDF document text
    • 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_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 11136 bytes
SHA-256: fa514b19220fc2c379b9f711b2afb9a8e13956c9b8ee35bca69c70acf98a2604
font_01_sfnt_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 16908 bytes
SHA-256: 1cd139a6c435f6e2da524c5c385bd1955b04b2addd92f5c30df702ae23a9b486
font_02_sfnt_off0001252c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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