Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a9c6d0ed5a4ed8…

MALICIOUS

PDF

271.5 KB Created: 2021-07-03 05:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 720788871eb218838cf2861a2b287c61 SHA-1: 19e523aa5796eba0df4e3a8d3b116fbd5bdeb7f9 SHA-256: 50a9c6d0ed5a4ed8d97c85ec58e010867fa7c3ddba227f71581f5c78400769b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a phishing document, including links to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external links, many pointing to PDF files hosted on potentially compromised sites, indicates a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • 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.
  • 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://pearproperties.in/userfiles/file/jekuzuvenewu.pdf
    • http://ackerviewguesthouse.com/userfiles/file/megavurovuwinabuporuz.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/3ppkmmmqleonu1l7e1qp80t71s/tolokumopeseranisawidi.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/f3791af1d871a5765f5534e4332573f7/xuxiluxigop.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/terekunefiterelixudoka.pdf
    • http://afghansolar.com/userfiles/file/dabejemowiva.pdf
    • http://kiavysocina.cz/UserFiles/File/dakomomemikaxonosobevo.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098459a0d0cc---pugowimikupe.pdf
    • https://partnyor.az/userfiles/file/gexeniwosuniwopibes.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9e0212f88---55059890210.pdf
    • http://elitaliaweb.it/upload/file/dufiwalopi.pdf
    • http://vizugy.hu/uploads/files/files/74188361455.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65f94a04d8---dezezivodotilirube.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090257cbf09b---12790017094.pdf
    • https://scriptdd.com/_file/file/84404419303.pdf
    • https://actor-conseil.com/files/file/1524159186.pdf
    • http://grupophi.es/uploads/files/zedubivekotifi.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/60778767035.pdf
    • http://konemara.hu/userfiles/file/bogumekapi.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a692b5b08d---73478403631.pdf
    • http://wearefamily1234.com/clients/3/31/31b46d3307e4516335aa88350909469c/File/41704118883.pdf
    • http://amblesidewindermere.ca/fckuploads/images/file/63745929585.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=1000+sgd+to+thb
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003d50c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3D50C 16792 bytes
font_01_sfnt_off0003ed23.bin
a4f00d43413822f7a8207b44c8d44a9f8a6601a4e675250fd62d3534467add62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3ED23 10108 bytes
font_02_sfnt_off00040384.bin
fcb4bea16754a805d3288609f523ddf0e8c4c3398ac26f525a267635150fa418		 pdf-font-stream PDF embedded font (sfnt) at offset 0x40384 17376 bytes

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