Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f3d8e1902ac064…

MALICIOUS

PDF

63.2 KB Created: 2021-09-09 12:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1127bec70f5c838ea33fd95f2eb4630e SHA-1: 09bb282d81ec3297f30157d2021eb16cff923cf2 SHA-256: b3f3d8e1902ac064676647bbe7ff8685207c8e3f01e0d29eb4b09edb2abcbf95
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6960

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://myphamasia.net/upload/files/9705420423.pdf In PDF document text
    • http://restauraceeverest.cz/userfiles/file/20548647209.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613304089976b---36852845134.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6bd0a24ce---wefozewamo.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/41854232820.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/62440766396.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/budigotuvip.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/25694785689.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/peben.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/ziruvivawinon.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/finofifelerijunujoz.pdfIn PDF document text
    • http://forti.in/userfiles/file/74586810650.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/kosepuwivuzotowavajalaru.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/54541575959.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/jopiwikot.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/78358928283.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2f10bf9a---jozudowidakufi.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/nutumaritaguguv.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/vejamogifofogajanapif.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133991d5c8ea---1380713740.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139810dc5e32---54216314179.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/dikajagoxakom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=movie+the+mafia+only+kills+in+summerPDF link annotation
    • https://lapdonline.org/file/14932439294.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_off0000d498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD498 10844 bytes
SHA-256: 669c8e91d9386acf6debfa65e37f751825bf43b55f402d251fc2b49df2a9f939

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