Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d580e92a4087779…

MALICIOUS

PDF

97.4 KB Created: 2021-08-10 03:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 820d091137bb04ac4f5ddcb649e542e8 SHA-1: ac6fb961295d81518e153f73e384ee233ac5092a SHA-256: 6d580e92a4087779e6e3881aff83bcb074f3a39362f9b09f4f2c3ea66e77c6df
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves leveraging these links to deliver malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e7f7eb418---86300373581.pdf In PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/hlbtc2f0hkc9mo32rqpml0hu58/diduwex.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1625247456.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b7c714d90---72627055011.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/53069723618.pdfIn PDF document text
    • http://kag.fr/userfiles/file/josuzi.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/sefivovuserukofowuluxele.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/51149887753.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/f44069d746d081b8c5750c52f4b0a0a7/19259567788.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/71252242297.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/58713094066.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/45654898585.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/8199890197a5537605ca0cb1809132eb/12676497848.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/mafenu.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a225705e202---fuzixoluwolez.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/99398753417.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/97291309095.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/448e897b9f55f468042c67eaed30f678/38766158873.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-2/20210502004655614742.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc8a29f3f0---77423913408.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16071d9d9b76e4---xugekavulukewod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mapas+de+karnaugh+ejercicios+paso+a+paso+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_off000114e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF2 18860 bytes
SHA-256: 53a4dbb3a90ab0d0c5460ded763da5aac68e5706ec99e197e97d8ce43da24874
font_02_sfnt_off00015ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE1 11068 bytes
SHA-256: e91cd746b400cb50368a19af7ec4db702a59fca6dce455b60c112d06bc50e895

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