Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3f54bc86c06b35…

MALICIOUS

PDF

74.2 KB Created: 2021-09-04 21:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fad6bd863ec14b03944b71f1a2b64122 SHA-1: 799b44c8b22a615a7c2157fe2eeaec2a130acaf4 SHA-256: 4b3f54bc86c06b3515fcff6aa236230296dbd83b9888fc57bf0c2b7072d989fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with several pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and link farm characteristics are indicative of a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://360mart.net/uploads/files/25896293719.pdf In PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/kudevopoxis.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f62c366009---tenuworezutolok.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/sadotuwoziloduxuwifep.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/tuxes.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/23003270814.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acbf6bb780a---vadij.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b399300eb45---69307459408.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/9b75526c45e126e711cb2ac00faf6ae2/83483248993.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b38ea34a7d---jejadukena.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fab28f9f97a---95656755257.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/uoscieclu6n7nk6c4p2iarr162/bokazuf.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16116a8dc005f5---serefotimemebuw.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/49ac3f2e0e8eaf582ade82d136220832/jemokosu.pdfIn PDF document text
    • http://hanleyresources.com/images/16571499604.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/36828411780.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/35028895102.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/13a7b5f4620630ac7548726dd9042d8b/83390652541.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/45359853222.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0046713462---kilulekunogejafudinojomi.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/41668127730.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/61585974534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=infiniti+q50+2018+owner%27s+manualPDF 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_off0000beab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAB 16228 bytes
SHA-256: a35580be895cd4914b4ed684a250c3be81b57604fa6a09ac95be693071faed13
font_01_sfnt_off0000e831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 11328 bytes
SHA-256: 28d9d78319ec811b0c2aa185fd2deda69fbd414c2dcee4e85930bb07be1731b6
font_02_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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