Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffab7680699268a…

MALICIOUS

PDF

93.1 KB Created: 2021-09-13 18:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7048ab7643d487a8e59f2623485551fe SHA-1: ee9ee170336105874ba7a26cb137e177be7800c5 SHA-256: 9ffab7680699268a1172f06fed5b3fba6476f41573aca654d4d5a148559455e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to PDF files hosted on disposable or compromised domains. This indicates a link farm designed to redirect users to malicious content, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://ngusacdon.com/upload/files/69159304104.pdf In PDF document text
    • http://gyogytornasz.hu/editor_up/wedebaretopixebupop.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/dutolokimasedes.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/55328408221.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/fewalaxu.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/11672fda7919db190bf6634fe65aaabc/nojapebudupabidirotebajor.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/94690509.pdfIn PDF document text
    • http://vititanon.com/user_img/files/15490175566.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/94755123885.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/25722979597.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/leneminaj.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/kadutikawuj.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/xowejavufoduwagoxib.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/walawuderimuwanovutas.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/1d9a9e13d118f3722927999b26284eca/36600753279.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313c9f263b4---22372790143.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/57427777126.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396808277c8---kovujegovamubobogojafiko.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/wumojafuwutawon.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/kozew.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/54810073649.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/66561765594.pdfIn PDF document text
    • http://espicycooking.com/files/file///45694062173.pdfIn PDF document text
    • https://rinducm1.com/contents/files/17706766833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=bin+env+pythonPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 19252 bytes
SHA-256: 210a9c5fa6dddaefb239611dd9e113dc21d113acbf26b57c4b2cb9862962687b
font_01_sfnt_off00011a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5C 10108 bytes
SHA-256: 6f0e0f65722b40c3acf0d4175abc70a71b469019283b500f5ea9cf65c3072489
font_02_sfnt_off000130db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000148ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148EC 18720 bytes
SHA-256: d56022cd57a680110301f50673fbc8942a73e6c7b867472d8b6dc2b235932ad5

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