Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6499a12481f28cd…

MALICIOUS

PDF

67.5 KB Created: 2021-09-16 11:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1622c9d566eb827e43ec0455b4d0a7e9 SHA-1: 2979a90443bf06d2d0bf3b0edda6cc9b8d3dace5 SHA-256: e6499a12481f28cdf8bf023e3caa8897cbbc6c329deceae8b3f753d8d3633939
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF employs a common screenshot lure technique, presenting an image to mask a clickable action that redirects to external URLs. Multiple heuristics indicate this is a link farm hosted on potentially compromised or disposable domains, designed to distribute further malicious content or phish for information. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cisseo.net/userfiles/files/ralenejewigasokovizer.pdf In PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/muzevag.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/jitetavezexipanuzezu.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/gobusewadi.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/kanixadakuwi.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/4827980653.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7518c7793---rixaxolotanibakiripafiza.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134986faf3a1---jivabolonesefonofuniligid.pdfIn PDF document text
    • https://synersys.fr/contenu/file/xuxogewadujime.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/78429922018.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/12406078239.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/4740190296.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/83943241838.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/gawojisunifo.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/xatefene.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/gamivavovoti.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/zuzisonexonixi.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/72ejbr2gcfavap90g03fjml75l/kafawirowujame.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/80823347646.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/rixemuraguz.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/uljkh8vcocs8naqmk3svhb9ji0/8226827226.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/ketexuxuzuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=flashvpn+free+download+for+androidPDF 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_off0000ad6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6F 14060 bytes
SHA-256: 2299f3682edaa4f8f5cd79ebca2016805ed9270ca9a32f93f2b99fe8c7611106
font_01_sfnt_off0000d057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86E 10624 bytes
SHA-256: 474da6ce47ba390e13b4d786981529e7a9981d5775fe55db5f0a3d01ad64395d