Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89e12843769b919…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 00:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 58e6b4d4e32321e20af383f2ae7c26a0 SHA-1: 37805048027b3520205939ea7f8373724882d0f0 SHA-256: a89e12843769b9199c84f7a3fb3408e4941a88cc81dcee6301e27319085baa92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised or disposable, suggesting an attempt to obscure the final destination or evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://smartcrm.cloud/upload/files/feputol.pdf In PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2f7f32396---rolawunosotezijoperokogi.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/patapetuvoxuwiluparowu.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a086dc3cb1---sitapilen.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/tomojurogutoko.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb7e5a7ab5.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/wipimeg.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/91691830809.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/26247583050.pdfIn PDF document text
    • http://chinalabware.es/d/files/99581827184.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/zuzupisotepab.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/2870a3d21376ca42f6176f9aafa476ee/45099701260.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/5399540146.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/biridoze.pdfIn PDF document text
    • https://koratspring.com/upload/file/nomebopuvubujegirexega.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/87941046301.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210909144533.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/25796425973.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210919103418_4ls3fj.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/1093331627.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/94623299594.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/22b98700a8796b6f59f03f3c2faff556/mugebasafozawukubivazero.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/15373660847.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/95544450097.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c27eecd147---68168357268.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/sazaxofuxusomosovabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sri+vishnu+sahasranama+stotram+pdfPDF link annotation
    • 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_off0000b3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A3 10824 bytes
SHA-256: e4cf784d3e30511ebbc37c03b6686d0813291d05dd648cbd82f10de536d273e9
font_01_sfnt_off0000cc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC62 16556 bytes
SHA-256: 13f3e31a669a267f87d71ad1dc404a047dd2b99d971fee21cc7749499228ad28
font_02_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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