Malicious PDF — malware analysis report

Static analysis result for SHA-256 306ed41dc8fb6646…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 10:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 32a8816efd7d185a1f3ec0ce334f6068 SHA-1: d4291ede0d9c3f5e53aefc056333b9535e538056 SHA-256: 306ed41dc8fb6646f32a714598f7a3ca0868e0115b57ad7e0ca69ba40e3890f0
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, many of which appear to be compromised or disposable. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings strongly suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5017

Heuristics 5

  • 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 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://birsamundapark.in/userfiles/files/64923780070.pdf In PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/bjbhvhmtvf48nefqsj9a7fldo8/patanigawase.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/18640543171.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/47926480948.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/12111473078.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/lafoxafozegawomitufew.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/ratorakujeregux.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/20a1ca1596dfba3d37545a28a4ccad4d/81884874164.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/7805566109.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f597b8c332---labugozakekid.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/vimomajilorumomotuto.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/rejopetikedimolig.pdfIn PDF document text
    • https://comiconfezioni.it/file/3620615065.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d285ea29c2f4e49867d7a47aa490ad07/dakuzisoxisuvor.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77d54ff83---lubiribotiwaboromijewojaf.pdfIn PDF document text
    • https://harom.ro/files/file/basaseven.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210627_CBC6D0DEC4682D47.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/wobokevidadokuma.pdfIn PDF document text
    • http://honda-vo.com/upload/file/dugun.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/fifoduzemib.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/ditibulunatamix.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/nenojalajuxoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=5th+grade+math+worksheets+converting+fractions+to+decimalsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 11204 bytes
SHA-256: f11a2517c0a0a8e3e0c13f254aee07a2dcb8a56b0959e730a7d62ff062eab4d5
font_01_sfnt_off000109ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AC 19112 bytes
SHA-256: 05bea81c689d2886f690ab38fdce1a30b8ad3b6cace0de37d48aaae2eb8a99f5

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