Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff1497657736e0a…

MALICIOUS

PDF

89.4 KB Created: 2021-09-18 22:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 77453a8aed4b3f7bfd44cb7d2eea799c SHA-1: bdc6d91ff0a75c07c538030cc208d0bc8093c3c6 SHA-256: 5ff1497657736e0a14291bfc3cee6db73c94a9a9c17a31ca5593d3a961f6cea3
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised websites. The PDF contains numerous URLs, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://studiogalata.it/userfiles/files/38403973477.pdf In PDF document text
    • https://agermag.ro/mm/file/59183688999.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161457cbcdcc28---3298413480.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/tudagojazuri.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/24017124088.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/98818453736.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/4696663956.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/466b3203dbc6bae8edfd8128fb1fa3fe/65079199835.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/selujogifigesor.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/suzudekomorabitos.pdfIn PDF document text
    • http://garderoba.sk/images/_file/tilasugux.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/54715285837.pdfIn PDF document text
    • https://pixel.bg/img/file/64449443246.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/jerebewuna.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/konebiwetamosu.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/lowukutusulinor.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/36775206098.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161457f4cc3fdf---13627092084.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/roxikogare.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cf3820ebd---novudawimomupuwafe.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e30150fcd---xefebedumexomuxumugovobit.pdfIn PDF document text
    • http://tianfonmm.com/d/files/78780747847.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/55466334703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=famous+five+books+downloadPDF 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_off0000f8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 17832 bytes
SHA-256: f955825a7fa33d93e71eea34f081c5c20866c21d82e44e33867a4e7618ef6bdd
font_01_sfnt_off00012734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4B 10780 bytes
SHA-256: 3cccc07e39851adde6c55c5f63d84f6e13d23ad544887d81244d52b4dcfe8f78

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