Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4fbb30885791f8…

MALICIOUS

PDF

65.1 KB Created: 2021-09-07 19:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ece413602c022ddb7ec80287c1062b3c SHA-1: 3521d59d97b9129b59231bca094276d37c4e533e SHA-256: 9c4fbb30885791f8bcfdcc16ef44478a1a6b1dc2afd95c884626982c7d89979a
154 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a potential phishing or trojan PDF. Static analysis revealed it functions as a link farm, containing numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. These links likely serve to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9203

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://gourmethousemacau.com/UploadFilesfile///befukexojufu.pdf In PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ae4190dfe---16022487020.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/59343882983.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/fd2b85878fcad731996bb14275bad49c/soparifegusufezo.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/nekilemak.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bef08c85ff8---6375631854.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/63447080198.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/53875751526.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16124cdbc4b697---rewovezunegemob.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/lexaladutotudaxab.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/ledotavigunipuxajabira.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/46226236063.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/26056595196.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/f76908d51ec392a054b8d747b7b0733f/lokepevodeluxid.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/33976808006.pdfIn PDF document text
    • http://bjallstar.com/upload/file/78628696119.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/lubabejixuxid.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/jm7e6k3bseuei45kuoubhl5nl1/84018752668.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/viriviburuzeteredodug.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f31dac75942ab40e9c52bc64e63b3878/29633856720.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/70618663067.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/vunogatomewekisilu.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/92248543297.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160791bba35c69---wujedobomobalupizadus.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/gizidutuxapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=forbidden+knowledge+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_off0000e5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C7 10540 bytes
SHA-256: 6aaf5b4c93ac49508e98122d6fadeb51904bba1edbb850b048fc8bbbab5c7e7b

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