Malicious PDF — malware analysis report

Static analysis result for SHA-256 c400b76e908c93fc…

MALICIOUS

PDF

71.6 KB Created: 2021-09-06 11:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b0033493f4207e79fc241ebd858b7be SHA-1: 9b37aa365f9ee33bb09eb7fc04968f586043e00e SHA-256: c400b76e908c93fc49fef9e6bd3fc8efea2e5e1ed0064cd1bdea3106a32d48b6
184 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 numerous links to external resources, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content or download further stages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://kamarkosong.com/contents//files/vusebomidugela.pdf In PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/81c1ac54dedd9492aeefa2a83f8b935a/vekujokonatow.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/furajusosaledavamuluxa.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/minevoxefanonizodemurijev.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/10150212930.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/69906856433.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/1ef6a8f54fb7d709457838af7c6d3958/tawivitugepud.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b32c5f6353a---70978467886.pdfPDF link annotation
    • http://adabaskimerkezi.com/upload/file/11495104636.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/4292784cafb61ff3447521bc80f1f727/80863258180.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/39s9cgjpaiumr7r2hgda2baa21/7642535756.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6228077b2---84086887466.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/63841177911.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/3oki6k05dbjp9pgl803q6025e1/defelezil.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/ruvozetevunusolu.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/13117804858.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/30876219800.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/66627707599.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/nudevazoledubizinizanit.pdfIn PDF document text
    • http://fluorescent-training.com/file/80034099296.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/fuxinediwid.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/36344526853.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/pupokapujatukagowu.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/tememikeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=network+processor+architecture+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_off0000b43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43C 10824 bytes
SHA-256: a97d80fc70a7b2f861ba00a1cb21b65b5cdcd8a2dcb6c3a2705208b72a20824c
font_01_sfnt_off0000cd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD70 16720 bytes
SHA-256: 437b9abc4282900ec052bdb54037ef6731b4543f6d5b71552766c6ab0d8a4f7e
font_02_sfnt_off0000f8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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