Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a47f4fcb46b680…

MALICIOUS

PDF

77.6 KB Created: 2021-09-16 22:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4811d6731afce7745dd48e90379ac810 SHA-1: 5453011b15e57a1d6ada6edc442ff285c2463c12 SHA-256: 17a47f4fcb46b680fc7a961149a98a74cb62b48ba0a319204728c3ea3e2b6610
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a link farm used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7248

Heuristics 5

  • 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
  • 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://queure.ru/uplcv?utm_term=geometry+dash+2.2+full PDF link annotation
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613649e88a670---jokumamunibiviluzezeg.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/tipilabuj.pdfIn PDF document text
    • http://1carl.com/userfiles/file/dopatibi.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/kuxaso.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd0f1025b1---12933446515.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3a1a110753c55e44e5c676cf76d546c7/25321323517.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/f0082747fa34c610c0dde589d46b9214/27626902985.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/15292342258.pdfIn PDF document text
    • http://preiss.at/upload_files/files/vidozenapazexil.pdfIn PDF document text
    • http://sartor.ru/upload/files/26712151745.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/pizaxupiraxebukutikubetef.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/51796086806.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202108311935301335.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8ebec6682---46225226638.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/gidusewumugupijegesi.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/c07c0d7952b94091eade0c87661e7d62/20095305904.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f9a50db48b3cda794c9edbab408cfd7d/83803041053.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/a8ac399b238951243b47157f4c83ad2e/lunevuxesodalirevulisow.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/zakilakilevaxurupume.pdfIn PDF document text
    • http://northcity.rs/slike/files/91957970892.pdfIn PDF document text
    • https://12waktu.com/contents/files/sonevusa.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/pilegejafego.pdfIn PDF document text
    • https://chptravel.ir/data/file/jutiveluvuwori.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/wikake.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BC 21708 bytes
SHA-256: 9018a7450c88216714405f93ee7380e31a8445ecf7848db21a6a10f1e5dbaee0

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