Malicious PDF — malware analysis report

Static analysis result for SHA-256 171a42d59315d651…

MALICIOUS

PDF

79.6 KB Created: 2021-09-14 02:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 30f8ece1296b36078d61a8cc73b02437 SHA-1: 6989a6783ed29a8700c198c058fe94fc10ad6630 SHA-256: 171a42d59315d651d5a2bae46369c0a3d2db803836cad6027e20ee3b03e69323
196 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it presents a fake CAPTCHA to the user. The document contains numerous links to external sites, many of which appear to be compromised or disposable hosting, suggesting a phishing or credential harvesting attempt. While no scripts were directly extracted, the nature of the fake CAPTCHA and the embedded links strongly suggest an attempt to execute further malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://riccaassociati.eu/userfiles/files/37245334459.pdf In PDF document text
    • http://tamtamphat.com/upload/files/forar.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/vivukamebafus.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/39618189043.pdfIn PDF document text
    • http://mylodge-naoshima.com/dutidijoxotodefofuzofi.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339e45f3c48---67302795997.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210909105145801.pdfIn PDF document text
    • https://maturana.cl/upload/file/pipavekojad.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130982b2b272---36367102093.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/88817172738.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109081747532942.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/bubox.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613437c50bf37---pifunimuwimovuwokukexidam.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/fewiresigawomedas.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/79383809983.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090208453384.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/zufutiw.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133845430946---jifitusefixopafozu.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/39389588806.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/pozajevogesur.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef15e2b0fd---15570409556.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/10666130720.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/baru3ju2b78dcheclipnpn5oek/bopetuwebomifomimusaxib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=drive+play+apkPDF 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_off0000d72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 16784 bytes
SHA-256: c305c9ca3bad919750151f4854fcd64fb0687a1d5c03b59adff670aeedde34a0
font_01_sfnt_off000102ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FF 10028 bytes
SHA-256: 820b8c5cb929c98901cf0df4ce5f9082db85694a3ee70fef7db44f794ec7246e
font_02_sfnt_off00011960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.