Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d2d2502051dbe3c…

MALICIOUS

PDF

57.0 KB Created: 2021-08-20 02:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 81416cda6a468db7367bacf6f7c64282 SHA-1: a9bf21dd9598ca4585a9990b4ec608d5a4cc141c SHA-256: 2d2d2502051dbe3c42bdf1fd8c54dc5b8affae122e6124b7dfcb7ea8c8fd7fe2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9736

Heuristics 6

  • 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 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 https://archism.ru/uplcv?utm_term=yds+kitaplar%C4%B1+pdf+indir PDF link annotation
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/pupotaba.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce0708e7d8---widiliseb.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/2436276476.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0f257c85---19254229910.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/27582460243.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/negon.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/34543250598.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/satosov.pdfIn PDF document text
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/35627584228.pdfIn PDF document text
    • https://domilot.com/uploader/files/sesomaxelakav.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/21611138204.pdfIn PDF document text
    • http://abpaluso.com/upload/file/66522179267.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2f681116771f64b94e41c0c21f85acd9/99562635474.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/30002564628.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/2d6dc3b623cea9e3831af385ef724dc8/zuzavimirof.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/dugoxiw.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/jrm01r6qfrbbc99hkldu5ds177/79349437494.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/towopa.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/zaxoweparerawidireduwoxa.pIn PDF document text

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