Malicious PDF — malware analysis report

Static analysis result for SHA-256 523cbd406c549ade…

MALICIOUS

PDF

86.0 KB Created: 2021-09-20 21:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9d8bc34e381fc4f6b3a59781bea7c54e SHA-1: b4a0dc90a6aca10343eaf8360931017b38e6fa66 SHA-256: 523cbd406c549ade3ab6d0488af71bbc92a5fea4ebda737ed9349480a54753a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to malicious sites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier score of 0.997 further supports a malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to facilitate phishing or malware delivery, likely via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://drafthe.ru/uplcv?utm_term=this+is+us+season+1+episode+1+watch+online+with+english+subtitles PDF link annotation
    • https://terracetemayonetim.com/upload/ckfinder/files/doxakukufavoluwizu.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/tatewimagix.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/17921750509.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/70713837427.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/69795701757.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///50667003761.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16131d426f3f91---66631304566.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/27195924776.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/49635447843.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/wenegoga.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/74910162661.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/24269942929.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/97793248603.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/9118438213.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147b7a13eddb---37664627133.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7a748a526---57659410152.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/jutam.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/berivegepogorixibekog.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/piwaroga.pdfIn PDF document text
    • http://congtyvima.com/images/Download/16079916707.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/09c9f228d0db311a74107a2fdf9f66e0/vekej.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/wuzamenaxifovina.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/73423033580.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/37699358971.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_off0000e8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 17640 bytes
SHA-256: 3a8c1e907f0f87aefe339010426beb39bf5d64c3de2583217d9d3f833ca958a5
font_02_sfnt_off00012e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E97 11036 bytes
SHA-256: 5cd50fad13f49b28574fb52dc79169bc5e0335dd72ce3dc06fff7719c4b0577a

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