Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb5aa124cce475b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 17:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0149e8cc0d1d71059cde4c42a385b8ee SHA-1: a014b8cc852efe324664947ab28645cf5fb2fd33 SHA-256: 9cb5aa124cce475b0800d6d25bb911dbeae48928402c9826c6d077f5305ad671
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=dil+dhadak+dhadak+full+movie PDF link annotation
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613545c88c09a---16999211482.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/83301944049.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/galudanop.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/83958553160.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/37994149198.pdfIn PDF document text
    • http://sireny.net/share/files/zegebabefinozi.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/wogafen.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090913072873499.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/molazos.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/sopenadisagidapefikapo.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/poromog.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/9a512f008cf7177eed5001515e5d0927/pazuxijifavoribe.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/19845739873.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/68629931312.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/lulodusiwugegulef.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/jubivepuwovumomo.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/kabiz.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/69873354483.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/peripijiwuvefapuwesipo.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/pidotowozesapemer.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/00fd5271455207d40473008497886114/gaxiju.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/90240827597.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/34003622666.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_off0000c659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6B 17220 bytes
SHA-256: 491ba54046bd0a544c6d17c147434b692bba25c6e467ff05793f726b3c1f3ac6
font_02_sfnt_off00010b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B71 10408 bytes
SHA-256: d8fa33ec8a511e209db8620a04b8ccbfee8c3cf4c88bde982112715658c33a35

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