Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1db5b9d9eddd0a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-07 15:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 75562aa3f86e117600f0a8960cad62fc SHA-1: 6891d10cef903a34bbcb5a480dc4ecb28ba11b01 SHA-256: 2c1db5b9d9eddd0a7efaeff14dfa3245f700b818a076e1baceaa6c334f6a1b13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the PDF format implies potential for embedded JavaScript or other exploit mechanisms to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6811

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 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 https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8311520068e17ceb8421dc0e8e2ad67a/nukegirosimeputul.pdf In PDF document text
    • http://texmet.pl/userimages/file/saremotevisiniwo.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/zebekuranekoxovolawonujov.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/65377210479.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/vhg8a272f63jgsvfoh4q8r2ug0/dijoxulavavositefegum.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6822ce5c9---vemulasudiwezutubo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136ab4ca5b40---3840554161.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/vazafaxutagawipe.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/7379bf11b48372ba6e1839d2b86b214a/sipusofizidubasizawurutu.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/butoduxukixozetajotegilud.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/xivujuw.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/h9mhn9k2j25s5v9vbf26vjhgo0/niganepigose.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1627973101.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/nifuwetifukaxemipepon.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105123895346---64578534514.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b359e2b69e42ff6b37a502586278e4d0/xafusajimebagazowosawo.pdfIn PDF document text
    • https://istanajp2.com/contents/files/vanezagonexagorudibezu.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/13931338876.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/81798173658.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/00465c5d5afcf20b6fabcbf9af1aab8d/betepijeletexajexenuji.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/menov.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/ag4sh5t1tfhq2f12qdq0qrhujg/radugewavovadeg.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7728ec8fd6---46555510495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=practical+english+usage+pdf+swanPDF 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_off0000d3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B2 10964 bytes
SHA-256: 919345c74b4de7a02c2c34f8f1261014825e209b6910d85b1e07209dc71343e5
font_01_sfnt_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FA 18272 bytes
SHA-256: a540476aba1ad570d963b099ddb1a72530511c5c7c8f22851ed01ce50216585e

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