Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5754a10a107e11…

MALICIOUS

PDF

86.3 KB Created: 2021-06-25 15:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c10b76e25668433636e57e868f1ca5f SHA-1: d346101af6f58d32ae41addc2723bb49c2f900b0 SHA-256: bd5754a10a107e11d156b9c7881df23f7f72b65542e7d1553fcdc47cf8e737e8
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded URLs are consistent with a phishing lure designed to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839602cd03c---getuwu.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c903a7e18f642724ed5df56ba71dd8d4/18545941306.pdf
    • https://isleo.com/i_photos/file/nuziteneru.pdf
    • https://acronimocostanzo.com/userfiles/file/43552426260.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1366372b2---zikuvedot.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bded79a19c8---32730891351.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/18015771274.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ab9c60e0de0eedfa112ad088ee1e4890/32672922726.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f081965e5---95432163936.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091555926b14---zewibupoperulexino.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/9fb096f06071d90a556d333d4c03d949/45031780849.pdf
    • http://mevlanaasm.com/resimler/files/xenotejimekofulekamirow.pdf
    • http://chroscina.com/userfiles/file/gikovazesukufole.pdf
    • https://securityguardsupply.com/php/uploads/file/30635443879.pdf
    • https://hospvetcentral.pt/site/upload/file/wijen.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=maize+is+a
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5ef576766a3f7617065d284aaa80654f/45541083417.pdf
    • 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_off0000f318.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 16792 bytes
font_01_sfnt_off00010b2e.bin
dd3d9ac274e25e705bedc5f7ddca09ff9209677fda0905f85443445bda4962e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 9688 bytes
font_02_sfnt_off00012065.bin
ef637a5152f16c282ead0060b7b260b2920aab7a084598bd252b46ddf9d2d878		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12065 17156 bytes

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