Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a9bd40b8a574ef…

MALICIOUS

PDF

86.9 KB Created: 2021-07-07 02:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c270d64e680b640acdbe3895467b443a SHA-1: 93a88afe527acdcc47be5033f24decd4d7a69ac9 SHA-256: a3a9bd40b8a574ef13d9f65e88ea2b22d0ed7e8976cece71ae8938b5ccf54b83
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of numerous external URIs and link farms points towards an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://iphysiology.ru/upload/sukexazivoneruluwire.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb685d2fa57---9466633249.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/vifexiremegaza.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/fivutijogopunafudebu.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b32595aac7e---84302128473.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c4a37d11a---bisibaxolopajonoxetas.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094110f4defc---rodifu.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/dulisukituvanamolole.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e49cb443---72391895759.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/84343843756.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160950556b270f---52591167481.pdfIn PDF document text
    • https://coluer.ir/documents/file/14571222746.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/pufalilibawapukowomete.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/5188891815.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/95113259947.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/kijumazulepufuwirebowelu.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc84f842a9---gufazagulimanizilenod.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f332630bea---54134351302.pdfIn PDF document text
    • http://com123.vn/uploads/file/pezizagesobazen.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb1c7e1798---87031047109.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c35ee206a---98296749661.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/39962355238.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61dad1831d---20394791871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=network+security+and+cryptography+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dcb393db8---18669077149.pdfIn PDF document text
    • 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_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 11220 bytes
SHA-256: 5106e14f7a2f19971cbe65cb6c2774a30d08367c189b1ab3d0b8814f8d61d6a0
font_01_sfnt_off0001091e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12130 17184 bytes
SHA-256: 3f005ee36401988fc786416b245c5db662882958d87cfd28bc4861e8b531a781

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