Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d03a77321bc0eae…

MALICIOUS

PDF

72.0 KB Created: 2021-09-03 06:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22ad75cf3073edbacf830e6e311a0d47 SHA-1: 475270bf6d6ce0d2106520bda09f07ee79af14a2 SHA-256: 4d03a77321bc0eaea208998dd043259757aba80cf5ba96672a44a0c3db0d572b
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or redirection scheme. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6611

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 http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f42d429650f---figolikuvuxusika.pdf In PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/33907875554.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/60052793798.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072c25349b91---45827955753.pdfIn PDF document text
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/62807197331.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ptkikeptj1tuos1q62ho341it1/jizor.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/pedawukabe.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/taxeleborazuxox.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d581a64ef9---xotozusoje.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/lowotekuxusasipogelifa.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/13990740415.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/zivixituroxa.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/bumobowejososajosisadiru.pdfIn PDF document text
    • http://medica-brno.com/files/85668944230.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/lumawolagufawitokedogu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160823a9697483---77630762859.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8o51ljqb6n5c5plp8d3s1b5n5t/vutiposozawusewadosaxu.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/tudusoxugo.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/zojisanexafowabase.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/30801287937.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/b92ed180f4504ad68f0326a904bbdb88/mitolivajajekegezepogogik.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ajnjt19i6nl6eg8u7acj6mmn13/siwikifugukof.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/8873101772.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/32922562017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=taiwan+economic+growth+history+pdfPDF 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_off0000e4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DA 18228 bytes
SHA-256: ab0ebb4c85d884a9719bc97c5af261de9f0e712e4ba14465e41e16c306f232f6

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