Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3b5e42d5ac1d89…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 23:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1c38af08abb86a4dede6545d4a985fa SHA-1: 03cba45b6d160eaf3052e639be15d3b7871c6a1d SHA-256: 3a3b5e42d5ac1d893565eea5d8995198ce2a77c6058378c1589666148a5f3b7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. These links are likely intended to redirect users to download further malicious content, as indicated by the 'link farm' heuristic and the ClamAV detection of 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=download+black+panther+1080p PDF link annotation
    • http://kaitosushisb.com/uploads/files/tegalixan.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/divuko.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/xusar.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/sawutesimiretege.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/56941283175.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/nogenutovesebomot.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/28519562403.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/94815142846.pdfIn PDF document text
    • https://profm.hu/files/file/mojadoxotobawupigedifones.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/34168531193.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/67146195758.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613043dfa00fd---89889856490.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/36e7a713a2b90d3d54f3124b5368df70/21162805916.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/vikavudevuzogeririjowil.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/75957680497.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/gug1gan2io5nqmdno8ln7fvobq/78807643055.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/19666341088.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2c6bb1311---56429013976.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/wuruziburine.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-15/20210915170513519931.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/lujabomizimopiri.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/pinularuwuzev.pdfIn PDF document text
    • http://apart1day.ru/file/35671820664.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_off0000d256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 19156 bytes
SHA-256: d585978a739f9a531b3d5d874b1b916ba35fd1554434f90b088ddb65c7a37c1e
font_02_sfnt_off00011ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE2 11052 bytes
SHA-256: 63db11acddec6d858c4f7eedc4e5067f4b800c123222dd2db32bd7bab4d896ee

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