Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f60b8c5b929c2a…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 16:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf71c84885ae5365cddcef956a629749 SHA-1: 311c04732924b9a93d7e7453b4e147b8076b9091 SHA-256: 11f60b8c5b929c2aeea7eaa747bd252f225ee69648e661cad4bf997b75d3b5a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=test+tube+android PDF link annotation
    • https://mahanakhon.pacedev.com/ckupload/files/winubugufituv.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/sisom.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/xuxusetuvusimugi.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/zakujob.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/julorabowufenunirexi.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090822033387.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/kezevosatedulinilebavaxat.pdfIn PDF document text
    • http://hkwwta.org/userfiles/livawejojatibekolifuxupi.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/tegagasumapuvimiv.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/12385261847.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/kovesotiposikisonagofilu.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141b54922cea---sumekaropedefomuxidusaxij.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/narenenejomep.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/fewudusitoga.pdfIn PDF document text
    • https://magnumattachments.com/ckfinder/userfiles/Files/gaturafovetawejege.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/gopefosenexisak.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/11/45029372340.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/vimuxukelepilifabib.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6c02b5067be5595ff974a37118facfc0/95176676533.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/ruzomubuvekigeri.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ufpd4g0uvbs20gg6fftid8nu45/48325492858.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/midojemedabusut.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/88768734038.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/lukinebapoluzizakib.pdfIn PDF document text
    • 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_off0000d659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD659 10400 bytes
SHA-256: 21486f958e8552f3507258bea7f1a8d4f9c9c62a2d05752e64c7984e7070d110
font_01_sfnt_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 16756 bytes
SHA-256: a1b7b84593d2cf4e5bc71117b744c290dd0062d4cbe2e7afad8009042870030e
font_02_sfnt_off0001192e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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