Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27e3960538a6b09…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 08:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8fb98d1ca53e165f66cb959d596e2e37 SHA-1: 88c5627b22e8f953967f844f79b3fbc1d2c5ea13 SHA-256: e27e3960538a6b09c3664571097212809bfed9164a8d687a6d2e3c795105a843
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely exploits PDF vulnerabilities. The heuristics reveal it functions as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The primary purpose appears to be redirecting users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=welding+symbols+pdf+free+download PDF link annotation
    • http://inglewood1968.com/clients/68690/File/sanujomixusinaboparo.pdfIn PDF document text
    • https://longhoang.vn/upload/files/mabikive.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/jt8ekdnc2spfljlpnt9t4lhq7e/43335998931.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/pezexumap.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbb6359c18---97706698047.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/s3g9qt99ielvaod9t23ife3ir4/kekog.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/1ca9cbb24b62c3674f6b36c1dd11475f/wejofamumamufixukaveru.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fda5f14c8---91777674313.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/12829766234.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c33514795ed---83544756046.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/fasipaduzovura.pdfIn PDF document text
    • https://blokhol.com/upload/files/luwedavetanodubemija.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/9166509141.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/welokejerexula.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/uiv9ppamvutmmrqvj0hsmtgcsr/63748440660.pdfIn PDF document text
    • https://digicpictures.com/downloads/fofidukozatenisaruwa.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/7l6d5rrfju4aim2ehur4kccim0/99659477185.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/84827738543.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/9826977102.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/68479812166.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/82420073056.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0982881fc7---27784559804.pdfIn PDF document text
    • http://ranch.pl/files/file/3452293739.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/virudut.pdfIn PDF document text
    • 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_off0000d171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 11076 bytes
SHA-256: bae8bc825d7b86950055f240d8d246beac25b8bb84b22ef71d97ef5d6a60221c
font_02_sfnt_off000102db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 18180 bytes
SHA-256: 851ee1ae8d97c1702ffa25c807f0f4fb15e49de723fbb25a2079a7ecce8eef53

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