Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb6a148fee74dc3…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 09:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 48edb3c7189e38061de46c9fa7ad08f3 SHA-1: 31b556e7078d4068a3f2aed1042c570e905854bd SHA-256: 6bb6a148fee74dc37ee987119f1467aff768b3e65c4f4732b6d7e1f9c202897a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to malicious content. No scripts were extracted, but the structure suggests a malicious document intended for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://1544-7419.net/upload/fckeditor/file/panafowofikuripov.pdf In PDF document text
    • http://dintainoodle.com/uploads/files/lopavubolinofazolewab.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/zenagogoku.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/4493049868.pdfIn PDF document text
    • http://nashcentralfalcon.com/clients/d/d5/d5bea9c86035def548a020f7371d19fe/File/16585837238.pdfIn PDF document text
    • http://greenreunion.org/clients/f/fd/fd69eab1634eeea6368acebbe5d5cb0d/File/51143117536.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/h1kkv25p62mvnshucev3q9gkql/xexivowawetupadabidutivug.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee583b90c74---81277299322.pdfIn PDF document text
    • http://rurisnet.org/images/file/81034133346.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2c7e4430a---24149396102.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/gafibifiporoxirefakadagaz.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/bdfa642a54b538d3b1d80f4fe8877365/87185744079.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/5e954bc26c4126be708ce23ab82f9316/59610915919.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/46830928390.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/20774584725.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061017504080.pdfIn PDF document text
    • https://uangraja.com/contents//files/kafowokerixojolizuve.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/3peclde5g4gc6r5f0dgsan0lr0/72878526193.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/jifupavuzizitilijudifom.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/zofasexiwale.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/55118833168.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e297ed41c92---dazukebesuk.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116464c634e7---rufodagejakoninubijav.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/cmchalpidekmg4mlnd78oq5g5q/18827593229.pdfIn PDF document text
    • https://activepymes.com/pub/file/wozebuditaxelibejaw.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d63b10e7c4---84013681975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sight+distance+in+highway+engineering+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_off0000d87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87C 17348 bytes
SHA-256: 7d1d5b72dbb04903a2c96c1e615bf93b3f6200a7316a6b45011b0d2a6ef82e2e
font_01_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 11008 bytes
SHA-256: 466844f0735d570209ca79666d367c3391c76b42762dd23b4e7f154e4f00f704
font_02_sfnt_off00011eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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