Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a9bf2570da755f…

MALICIOUS

PDF

70.7 KB Created: 2021-10-06 21:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 762d53c27abd6bfc49c991822d28097b SHA-1: 349351bfe4c0958e8c4f4b43ed2cb56b98e91270 SHA-256: 42a9bf2570da755f641f0da32aff42dd20033acab3b902390b855689b79c3651
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing metadata consistent with a generated document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8262

Heuristics 5

  • 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
  • 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://rockefellersgold.hu/editor_up/85288462971.pdf In PDF document text
    • http://powerfalcon.net/uppic/files/8353794806.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/86396637892.pdfIn PDF document text
    • http://webs.eusko-ikaskuntza.org/files/galeria/files/11231004204.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/69835268257.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/jilogegutitisiwibam.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210905175835.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/76682286341.pdfIn PDF document text
    • http://xhslsh.gdx.cn/ckfinder/userfiles/files/bubezumudarulup.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/kagutirigufu.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cd1b6d36---kubafadupo.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/vinimolepilodom.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/sakasovonaxa.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/51308703550.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/51785687677.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/90581312486.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/41112371460.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/70494474890.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109092050534221.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/58390504571.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161543ec8762f7---74838734594.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d481fd5dd395e05ca10836b03526b79a/sowuseximebitolapenejedaz.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/figerok.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/guxigapilejaxizozuzet.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/73696132012.pdfIn PDF document text
    • https://anandalaya.in/resources/file/ruxotisalategifuwaruvu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16147a609bb13e---51590404717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=readers+notebook+5th+grade+answersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95F 10884 bytes
SHA-256: 7a22b009e35d1181f35f2082de331f6bb8dd8a860ae9f07a569e46b5a7324006
font_01_sfnt_off0000f262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF262 17720 bytes
SHA-256: 78bdd41e93364c832aa561d7ced17c2b0d51f410d72871e29b08d1e6b8b9284b