Malicious PDF — malware analysis report

Static analysis result for SHA-256 414f9a07eb13fa80…

MALICIOUS

PDF

86.1 KB Created: 2021-09-04 18:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 87860c4564c53a4822cafc14a797eb43 SHA-1: 24cf4e9793b01c23b2f6d0b31a9f035711b35f8e SHA-256: 414f9a07eb13fa80c73e8d2f962ae34cc8332c9e6b688cf3078015370a26cd12
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and is identified as a link farm pointing to compromised CMS uploads and disposable hosting. The document body is unreadable, but the heuristics strongly suggest the file's purpose is to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=grandstream+ucm6202+ip+pbx+manual PDF link annotation
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160734223019fd---gevimunomabamitusugizoxuw.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160849b4712b9f---diviworuxituzi.pdfIn PDF document text
    • https://majubesar.com/contents//files/lomaxezamunodudane.pdfIn PDF document text
    • http://abc-tel.ru/data/File/66957490179.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/67210916846.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307eb8a297e---janumaxizakoxukasotuf.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/74402461083.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/kotuxisizuten.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/gifim.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/tlhcpbkgul0gdg2e9smm1ujcag/74670626110.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/29994824577.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/buduvimivodonu.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/woteputujuniwomajonezow.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611a23ab8df6e---leselemokevaza.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/59702224542.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608717f805579---timutatinulozefaw.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2347d36d50---76637080407.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/zikodobuwawizilun.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/nadilasiverosezevekunowe.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/bupetu.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/73281485650.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/goxosazodiwalodijudexedu.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/70102438507.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_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 17980 bytes
SHA-256: 271127c2b75658e4df5ab3c0423e9b9ea0469230a61108648ef5890d3df0c784
font_01_sfnt_off00011682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11682 11344 bytes
SHA-256: e2bdab6cd01e3400968b1ce8aec2ce0f60940fdd49652da834089c754e3754c4
font_02_sfnt_off00013106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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