Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7c3da515757170…

MALICIOUS

PDF

80.2 KB Created: 2021-06-25 15:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00eba1df1537b53a9452dff75efe86f0 SHA-1: 50903a987aa9234f90e922f704d68a6bfeb91af9 SHA-256: 2b7c3da515757170e89cdd1a2a3c8153c8f08d547a29da0c68442f0518d7972d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious content. It contains numerous links pointing to compromised WordPress installations and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm nature strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87dde2469c---37807480446.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/3cc7f9eaba32748c868abb4cb0b1e3c7/kifokuvexadadiporemapasol.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1ac65ea77b5d7ade8994e2b1626afa7a/46272370996.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebad19002f---sajuxelakexajamu.pdf
    • https://clumba-indoor.ru/files/files/29441702341.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d459882d---muxojudarokuxozideg.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0636cca02---1044114201.pdf
    • http://asja-doll.ru/userfiles/file/buvadelu.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c5647870594---91087791280.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cba8d49daa1---zegiwatolapo.pdf
    • http://busanpc1.com/upload/fckeditor/file/54686404658.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dbaaa46c9---wosamuwegitugijirovab.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d89c92753---10798586312.pdf
    • http://sutphinsgermanshepherds.com/clients/21958/File/zarulipeb.pdf
    • http://ingenermarket.ru/userfiles/migobalad.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=if+clause+questions+and+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7cc.bin
9a7ee9259069d90a3f85d1df12c1e5967655bc46efe5a9baf07f7e5b8dba1881		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CC 16680 bytes
font_01_sfnt_off0001035d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1035D 16792 bytes
font_02_sfnt_off00011b74.bin
a561b8e14bdf30057c44146f71053c7d816bb45a62a92bfc9475761e90d00ef1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B74 10752 bytes

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