Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83ee8c003e4a874…

MALICIOUS

PDF

71.7 KB Created: 2021-10-02 16:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 51e4cae25f67d39e68aeda771bad330b SHA-1: 21fbb2857c322ece5a571c5844920b8940e70c75 SHA-256: d83ee8c003e4a874fc8ee7d5b8ce1f5b8f110e94c7154386d693b281e67673d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised or disposable hosting domains, suggesting an attempt to lure users to malicious sites. The presence of external URIs and link farm indicators strongly supports a phishing or malware distribution attack pattern.

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 http://alarcon-v.com/editor_upload_image/file/63935420967.pdf In PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210901081845.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/kegimutum.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/jurisabaviboleluzuv.pdfIn PDF document text
    • http://cnfgl.netsociality.com/upload/files/85269366170.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/85226835442.pdfIn PDF document text
    • https://arsenev.verlauf-ekb.ru/admin/ckfinder/userfiles/files/fetemavomoriluvut.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/pasulo.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/zufebogigevexadaraxiga.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/fipukekozita.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/kuvepenisowezu.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/xetozanu.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/xezuso.pdfIn PDF document text
    • https://unitjaya.com/contents/files/gebugi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16157b91e005b4---fufukirojelorepufabo.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/bovexatofunixibol.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/rizag.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/75740663285.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/muxasarutataw.pdfIn PDF document text
    • https://valuekare.com/ckfinder/userfiles/files/laxojudidedozik.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0c831741f---lenuparoxemigevi.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a72d19bfb---5476085168.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144502b1241b---90401130949.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161489ddf04504---wawuzut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=polygon+with+2+parallel+sidesPDF 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_off0000b5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CF 10992 bytes
SHA-256: 8b7a36616e00af0837ff825d6ba0b8a73f51aa738c55f02c038ff1047b0b0b60
font_01_sfnt_off0000cf3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 16328 bytes
SHA-256: fbda23ffe4eda71439f1e1d40ff2abbcff80c0acb41af765da8707bba6e5a3ca

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