Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b35221cfb99c5c…

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 02:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63e0cf84b23181229d218e15e6c9219b SHA-1: 3b9f1306067cae78c399c346db01a6b6e09093a7 SHA-256: e6b35221cfb99c5c62e8d42bef2e466dd6b7d76b356a2f6dac15e6975ab90e18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://tenshinorchids.com/FCKeditor_upload/file/17261635942.pdf In PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/dixikiwuzesumena.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210915193029.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139487c6e88a---mujulaforuvubususe.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/70668814532.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/84662105134.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/sanemetevurowisi.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/daxukinamulaz.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/51273032252.pdfIn PDF document text
    • https://panoramabyty.cz/content/tekomimu.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/vojufukoneribe.pdfIn PDF document text
    • http://kodemari.info/data/files/13200559029.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6e5623082---28277974127.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/worolulimininopufipuxa.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/kubazebatomabola.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/dufadokedosa.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f06b24a0ba---gibegawuvomoliribirikarun.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614139ed8cf59---jesaxobizujififilog.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142bbebc433e---32324630742.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/16245125191.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091719465573499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tubidy+io+mp3+mp4+free+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_off0000ce38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE38 17504 bytes
SHA-256: 59430c9441f04271502bd83af0d3b78b8b0d58a473d29e7f539d68dc90b9fc54
font_01_sfnt_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 11048 bytes
SHA-256: 394388783d02868b1455371e63ccc3fb98fcf26fe9369aa43b8894929695fc5f
font_02_sfnt_off00011524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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