Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e163f7e3522149d…

MALICIOUS

PDF

74.9 KB Created: 2021-10-04 19:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 832cfada7a762b43d6846132a968948f SHA-1: 5a4cc6746ecbfc970bb7a087d231bc8c4375d7f5 SHA-256: 2e163f7e3522149dc94af30c75ff946b92b780eb8d92cd60229c51935ea5f997
134 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains. These links likely serve as a lure to download further malicious content, as indicated by the 'PDF_RANDOM_URL_LINK' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier also flagged the document as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7633

Heuristics 5

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://autosoftware.company/autoresponders_images/files/medozuf.pdf In PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156160e7091e---23506256241.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc0d3f0daf---lexojujafimajupagewe.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/77395413241.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0164e2214---66691703534.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/bugisemisiri.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/31101339526.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/61268465218.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/64abba35439d441e25fcfee6ec316fee/83785374811.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/90561324593.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/4242062001.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/35553734085.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/nisokazifekivolijevuk.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/wufol.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/68015724001.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/22587641135.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/12959193126.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/panapoxulimawifix.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16153990916572---xibalomikan.pdfIn PDF document text
    • http://dakov.hu/_user/file/sofanelezolegenoxobu.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/bibagejupomufebolukexof.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/nuguvo.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/darote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=neopet+brain+tree+quest+answersPDF link annotation
    • 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_off0000f187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 19972 bytes
SHA-256: 57bcc4a00bf0a77a0a84baf72b629bc1f2a1f46d3aa9b83a8266491d81fb4c06

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