Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b670357ddc5217d…

MALICIOUS

PDF

84.5 KB Created: 2021-08-17 07:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5612060d977dd9049171e54fc2157bb5 SHA-1: 59abbe05b75528e1412963ba71d953bbfae6e03a SHA-256: 6b670357ddc5217d6ea2a5cc936324856179c408f27d9eb51d647d69687d4482
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS uploads and disposable hosting services, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/o66q2berura3bvd68di028nrna/terob.pdf In PDF document text
    • https://bitree.com/ckfinder/userfiles/files/53613669601.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e46a10cdd5---81215472586.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/41526408672.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b0a44498934f0f7b3c48cd13bfad989/mivasonenivelepoxe.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/wejitevaxowe.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/k6kofqb313lh2k6sc8nq51ij3h/76028792469.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/18092065921.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edcd819ebf---dakidewobo.pdfIn PDF document text
    • https://plasy.com/uploads/file/tifamumopemutaj.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/vabadebaxamepujol.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210728071046.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0d7f27090---muzavuvikimezexemukad.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/55233409211.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/muxopopulobumi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af71eef0c19---tewigisomopiwow.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/39671747060.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095e4060c748---titulevur.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad5847b27---96860543746.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/77788568468.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7c281042aa3c62229e6b14cc2c714ebc/jafowepixigajakogetubalu.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f02f7a8422---63756645184.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/21428866494.pdfIn PDF document text
    • http://highdesertrent.com/newsite//images/uploads/file/kenusikedogepolinipedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=competing+visions+a+history+of+californiaPDF 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_off0000e5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A9 17160 bytes
SHA-256: eb72da61fbc30e9dd9ea2da6839efb6a4a15e26ffcf32d0be014c06a911752db
font_01_sfnt_off0001115f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115F 11140 bytes
SHA-256: da56f5627443689f42e03180204ca9275b6c7542d35a37520f9c2b37b94bd67d
font_02_sfnt_off00012b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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