Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ce5df5d4f0c0c7…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 06:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 734ec5047e52cbe51d28332ef37d0995 SHA-1: 99ae08fbcc2d9f4172337ce28042e8bccabb5b3d SHA-256: 61ce5df5d4f0c0c7d504843bf222e30089b8bfe32ddcc8ec23573959815281b5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6111

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 https://catamma.ru/uplcv?utm_term=tunis+agenda+for+the+information+society+pdf PDF link annotation
    • https://www.abrasco.org.br/ckfinder/userfiles/files/38428972196.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/sifivebod.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/98383086819.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/49082493566.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/48595283545.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/17c3b1f295cbf00c411398e01e37678c/87459427240.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/doleleba.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/dibiz.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/baguxasoxifomozule.pdfIn PDF document text
    • http://fittbike.hu/files/file/vofofazepowomotafolelanaz.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/45705132714.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/dopazon.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/bezagozuwalaro.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/jibixar.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093b061a6211---fuxalajogiwuji.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/8525352990.pdfIn PDF document text
    • https://scriptdd.com/_file/file/49011783046.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea4258e1e8---15890042947.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/44156992182.pdfIn PDF document text
    • http://turkuazhost.com/calisma2/files/uploads/14638880299.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9ede99de85fe42b21a03b6a028cf5e98/dolepedirixamutipoxat.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/n4fahtnpsgghp32j31m6s177qe/86610088100.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/22402786190.pdfIn PDF document text
    • 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_off00012081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12081 11200 bytes
SHA-256: e6a99942f005b8fd1789cba6ea4e6c65463808fdfcc1652167642f4d4321b73d

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