Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e39394d033f6d19…

MALICIOUS

PDF

72.2 KB Created: 2021-09-14 15:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23bda8b22f5d02265a2d309d9cf1baf9 SHA-1: db966a2599133992f17e5f8d3ce46bdfcb5a7f52 SHA-256: 1e39394d033f6d195f7367703243614c18c2c2397a69478bdf11ef8f788f7f07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs and link farm patterns, indicating a strong likelihood of phishing or malware distribution. The PDF is likely intended to redirect users to malicious websites, potentially for credential harvesting or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=elements+of+physical+chemistry+7th+edition+solution PDF link annotation
    • http://tylincms.com/userfiles/files/vewewosuvivejowirefavepu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613428d6a1668---rexadigelumipafuxepupupir.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/xorumenexelitiwane.pdfIn PDF document text
    • https://beautydent.hu/editor_up/45221551048.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/29125158459.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/23826080168.pdfIn PDF document text
    • http://rideco.hu/upload/file/23623266519.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/5thnit94dav4fd6v2lthpoii8q/sefituw.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210905165957.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/jemaduxex.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367346ac8bb---62877701804.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/xowegimelavew.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/givozobobeguwajiposu.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/sojezozuzugabodilexe.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zagawuporololilozu.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/42647108602.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/a24e5e54fca39f7102ff363280e01e2e/vesozagoraboseratu.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/92113615418.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/19865810607.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d16d696530---wegimowo.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/wobozifawamidijoboruberi.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/31140146259.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_off0000b685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB685 11132 bytes
SHA-256: 28d23781d06e0cfc0c23c7bb8a07f22d286bfd29e7044e86a1f95113680bb564
font_01_sfnt_off0000d063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 16508 bytes
SHA-256: 85603b7d40fce01bea54f048ae51fbb29d3e6ff57223bf06daf6d2d01eca791c

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