Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff1a6e6203730bd…

MALICIOUS

PDF

78.4 KB Created: 2021-09-14 00:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 24ef9701bae10d1a82031d2a03a89ae6 SHA-1: 5112f8c641692ac4d9f7e78a74a42a73ef34ee2c SHA-256: eff1a6e6203730bdc35fc32758d97947754896f044676898eb3592e3ce9765bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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 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
  • 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://selmanoglusigorta.com/userfiles/file/30295136416.pdf In PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/12715007650.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/29895472296.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109061045198485.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/15450099355.pdfIn PDF document text
    • http://xibuhuanyu.com/filespath/files/20210902131203.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613789337f7cc---53935235041.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/37993033801.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee85ed5000---mejan.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gb9d2a6j6k0u23lqu45qovldm4/5942831602.pdfIn PDF document text
    • http://foodchemsino.com/d/files/1311440296.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/94027830292.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613deaa66bdfb---fivorib.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/torodozebamobogekepuged.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/disipu.pdfIn PDF document text
    • https://dhesient.com/media/84834749503.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/gipezebexopipatokulof.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/3551486769.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/bulovifepolusevubixudi.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612faae72f446---nuken.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138304573d9e---vamam.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/80855649798.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/39167848077.pdfIn PDF document text
    • https://uangraja.com/contents/files/86244016965.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/pojenem.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/xubefakipobasawedeporozag.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/94072416292.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/tataludefuwasin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pixel+worlds+unlimited+gems+apkPDF 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_off0000caaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAA 18092 bytes
SHA-256: 0090292fa9a03d174a4af568a6cdbf45beea06ca5748436c184e77dea5a7a8b9
font_01_sfnt_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 11116 bytes
SHA-256: a9b49157ba65a24f894d4e84d1b5eda73f192b6fe6ffb3551f131cbba7f1ef65
font_02_sfnt_off000113c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1