Malicious PDF — malware analysis report

Static analysis result for SHA-256 712010583f556ade…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 03:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 937b82da7e2d8a4ed1a1f34415964e7e SHA-1: 6b6b6da0e9b891f7cda672ff39dd096fbf29b516 SHA-256: 712010583f556ade9121932846bf3100a84d5fe254bcd163f9cf2cddfbb791e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. The document's structure as a link farm is a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=employee+relationship+management+project+report+pdf PDF link annotation
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845cf1f047d---72615952687.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/zanavasu.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/segituf.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/xixuzeb.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/jewilojowib.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/65647236576.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/69d0afefb6970e0acabe98093f8eae8b/golisivimutepeja.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/49942006008.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16129f9375f2a1---64326424549.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae40d61af45---38479083864.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/dlm8aqki6uk44rt75bdn9r64ob/fugura.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/81160889640.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/dukofunojajivuxad.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/litup.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/44794394541.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/ac3107d76323fb6e57518260742639f6/66522257252.pdfIn PDF document text
    • https://shibbirs.com/media/files/ximuw.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/xugetijofititunojigeroral.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/f3f3b8ac47d46f48c319a4fa1c0a6438/79795358774.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16100bbb601404---zipebol.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/dotujomoga.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9650932334---8415813978.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/pituziripugibufiledo.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/99347211281.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/2ss6bipm5kd3shppg9uq1ssc71/volunajuzulixim.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_off0000cb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 17400 bytes
SHA-256: 885afcf6db6c752a59ce248aa5f12dd4e0e3bc9c0b4c6879586de1073be1e98d
font_02_sfnt_off0001102d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102D 11292 bytes
SHA-256: 9e8a4210ab42fa37aff63b5714b92f0cef3afea2772a51b0ea687cc0eb95e0a8

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