Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa80a66afe82869c…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 23:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d45d2f47ba5a773800953903155b2eb SHA-1: 9da4d7ed198ddacca809670d495a6f341fc8b7c4 SHA-256: aa80a66afe82869c20c6f6e5c99a3597327172f819dfa763d7e6152fb9e0e69a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100b72e9b0be---52209334496.pdf In PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c052e431345---10717618396.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/jurogugevenonak.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/3284f9230eb7d7525ffc8d7625640a69/60845822966.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/126991148.pdfIn PDF document text
    • http://salt17.com/userfiles/files/pamuwowodawemubiroxa.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/4774511906.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/b6675a2652223d0ae15c941c05a02d5a/51011449072.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ce14dbeb97244d3e77e4d0405bb31104/gexizitobotitebirapijota.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/jelikesawafonaju.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/54438315208.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c1c13d573bcb2fc32ae5ad455e0bd5ad/detasuxabito.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/bexodexoviminonugis.pdfIn PDF document text
    • http://zubrcup.by/files/files/bugujivolegowolojexux.pdfIn PDF document text
    • https://guijek.com/userfiles/file/78126279028.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/31374520992.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/wegusufo.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/60453177720.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acb33f02ebc---30370868369.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/sagoloxanavuseda.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1fc34263c---8145214445.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076578f5c7e8---besotunupaguwudinajemudo.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/xijax.pdfIn PDF document text
    • https://x-software.cz/data/file/kivojudezigumadu.pdfIn PDF document text
    • http://kodemari.info/data/files/37181796775.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b217cf696---fuxugotukesoruwoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=dictionary+english+to+english+download+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000e1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 11100 bytes
SHA-256: 38218a07ace39db2ce1013424d5445f60d8f604e31f68efc2f0f09c7dd9631ce
font_01_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11378 19272 bytes
SHA-256: ba1ef200a938cc8bb8116a0ab1636b875d38fa50723bebfc80c2de8244ab58fd

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