Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd60c7ba7d7fc97…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 05:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 183f2a1a1b7c048f50195a394292c4d4 SHA-1: c18e3951f92e40e2b56b6ce0f62c75a5823d5b4c SHA-256: cfd60c7ba7d7fc9716df523db86a26a4c7360cfa87fec9ab92410ede63bc0d63
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of distinct links, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4110

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5utt07h0530lkrl29qr8d16sk5/vajowodanakaberegob.pdf In PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bff8d1bf6---fiviw.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607845374ef91---86362346027.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/begun.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2cbca1e9---92427983372.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8274712f63c6e8893929c18647e5c20b/zajisixemevokidizijum.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210714034743.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bde06615616---63944024441.pdfIn PDF document text
    • http://mq-water.net/upload/32959170423.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/zewed.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62205f3048---49889934804.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/61451798e0497fa07b4ed13a1c4d90e9/xewiza.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/e8474af87a5856e5f3d0024ed231e000/70941791430.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/f6f3822d9524522ec20c71e02ec485b2/lolekobikegix.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c907eb60f---wutufixuxiwasilefisenos.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e1924f4192---rodokosi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107305a4dafa---jawipexuravugawoni.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/wenufixijabuwewesedax.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/bijotowaxesusos.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/zulimizolewebikusaloxoxe.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd30359f04---79247230429.pdfIn PDF document text
    • https://aitalk.vn/upload/files/zapimodogiju.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5b72591c1---tebujewusokak.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/83475000423.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/linapepotumalovuki.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/84a5c2fbf3094daed55a4f1f15a8da06/dumanawarojolakikazot.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6a58040f1e3aea3e479fd48e711d2a08/88429342630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=missing+number+worksheets+year+1PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17A 11088 bytes
SHA-256: 8be819c8a7b0fe955ba523ef79f5782099a4590b9f344b12c5db21c9f970e748
font_01_sfnt_off0000fb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11358 18076 bytes
SHA-256: 8c1f956e7e44106f9a9bc75b4784f13175d7e5fbc5ad21f2cea3922864f2a7c9

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