Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62331f9d3b76eec…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 14:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b21506ecd85533f65aa3e456fef9f702 SHA-1: 9a5aa4e9adba1f13631d4f849f8af48ab099e959 SHA-256: c62331f9d3b76eec229abaaedcef883281fc2c9dec0d3d6fc9e5c2789b55248b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The document body is heavily obfuscated and does not provide clear textual content, suggesting its primary purpose is to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3d27a200---60966578907.pdf In PDF document text
    • http://fukaofoods.tw/uploads/files/202109022010098203.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/nuxexugubugore.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/malafutujepawufofibamigup.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/81gg19l7ajuhsqibpd6f38k9h2/51702752710.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/mosomolodutapu.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad42ddb84---mujojosoki.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/dixekona.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/031823377028.pdfIn PDF document text
    • https://il-gusto.com/images/file/kuvanawuwexekowamanitoja.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/kazovafebunitono.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/jirowomifepolavugola.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/bewipe.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210901_65E1ACA8AA0DE974.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/53478690285.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109010837507678.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b5eb6245a---senasemizigodasutoted.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/76433428347.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/supofosodaliv.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/waputaw.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/nuvorajolatolisajufeg.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/nasufazuniwipin.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee2ecf3228---51158854717.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/25803885389.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/juwiz.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139685f8606d---zaxemanasuximalixena.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/52196158224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=game+survival+android+offline+terbaikPDF 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_off0000dc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF458 10952 bytes
SHA-256: 932b63042ad0677b1071bd3eebee558d3f7184b2eb7580a9c641f24d4d772a40
font_02_sfnt_off00010dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBE 17588 bytes
SHA-256: 8e2056bf0c72483c892231b91de227917b0b9b715c2885151b64117645f8530c

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