Malicious PDF — malware analysis report

Static analysis result for SHA-256 68cea9df87e9206b…

MALICIOUS

PDF

66.1 KB Created: 2021-09-06 03:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec3d75dcf87a25e7be9e1b78c091b7cd SHA-1: 106631d2d386f03122dd5769db0b97a1d9d8af31 SHA-256: 68cea9df87e9206b1b9ea6a923661c3933839a03c586f50c2fe31738c1cffd6d
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple links to external PDF files, some of which are hosted on compromised websites or disposable hosting. The ClamAV detection and ML classifier indicate malicious intent, likely to deliver a secondary payload or phish for information. The presence of a JavaScript stream suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5479

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://maekuangudomthara.com/ckfinder/userfiles/files/bogedomerenota.pdf In PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/togumumodazafet.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/478521233ee1e9240a71aa677b6d32bf/50180414531.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/xijazamajopamurusutijoka.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/15249105856.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13a75716a2---xeduvobodizazezikeb.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/17e2d89b1ce1174197df2246b919297a/33379050387.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/gomukaxuvesipatuwowizepen.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/e2c29fab0fe799c1f3c15b8d9d44ae8d/kagevurezisizarodi.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b822988049cb4fe243c4c9d009aa577a/41711334292.pdfIn PDF document text
    • http://www.asslar.de/downloads/zazikudalir.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/zurewigesubilenijumamexi.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fb847d7df---30166737350.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/4363169468.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/datafolurazikato.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/67511119454.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/12104306627.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/88854312437.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/82705139890.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/23616257437.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/riramenokimezifufakidul.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/walasuwogepivobojumamu.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/63c356b6161f5fceecbbbe2d7f40eea6/wafagimajabufifujadawe.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/64999631848.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/62855821259.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/govelabepixesapivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=importance+of+qualitative+research+method+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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