Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c83fcbd5addc39…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 11:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 65e184379b9b0141b7530171a4679f27 SHA-1: c20ae8c22f5af4194844c326c18fbf483ac2a7eb SHA-256: 54c83fcbd5addc390d8f04aa828df0267f00d9b97d6ba729eacd9e9c0fe32fac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to create a link farm, likely for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://catamma.ru/uplcv?utm_term=best+android+gestures+app PDF link annotation
    • http://to-kajihan.net/js/upload/files/vawadapipasofuruvev.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/mekesewudav.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/pefepagupugapirot.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/vukuxefiraw.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/87027842963.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/78545072438.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/susezafonir.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142d9b92329c---filuruwiwivajom.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/68258157958.pdfIn PDF document text
    • https://bataretak.com/img/files/file/jilaborarute.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/35076457708.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/040100218459.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5202018f50ed640fb2c2a5b26a3e700b/61339906649.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/visoduxotufupavebaf.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/toranabumine.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/sopaguluvizexi.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/aur343nhefsvr00qohsrafap84/80579392000.pdfIn PDF document text
    • http://pk.mo/userfiles/file/sesojenumomub.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/pamazozasogefurupafa.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/dozeladikoboru.pdfIn PDF document text
    • https://reha.bg/content/upload/file/1054903710.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/15953183983.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133c897b66f1---vadufadidobevodosew.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/14217908084.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/zolakipiwinixewu.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/binawepiboni.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/95314737692.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_off0000e3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 17180 bytes
SHA-256: e6537fbc799c88a97a2e2704c593e845381ad6e13b97ee68daf5239ef9e5c83e
font_01_sfnt_off0001103f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12856 10672 bytes
SHA-256: 0516672bc46792e233e8816af1856182cadf53e9e376c8124c881f09aeb3e51e

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