Malicious PDF — malware analysis report

Static analysis result for SHA-256 46928eef526e5ea1…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 16:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0cd9aff1f0161caedd5d2a3a7ad1bcf8 SHA-1: e9f20b236d5592e26502006a00a43ea96f1fc6cd SHA-256: 46928eef526e5ea1863b681bcc08dad0fec2a8938e59170b164544d0e3269f0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a second-stage payload or lead users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://agriturismolescuderie.eu/userfiles/files/tevebiri.pdf In PDF document text
    • https://jcmimoveis.com/userfiles/file/64200193427.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/silaxajoxanigepepop.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/buzululoxasajelozun.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/49156081742.pdfIn PDF document text
    • http://fteq.ru/files/file/xadinefakobanux.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/cd3330621e1808a8f85ca897c5318f11/22262162502.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/mivonezexunolili.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e685c02f6---84773260128.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/23277066924.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210910082727.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613784872362b---94804615458.pdfIn PDF document text
    • http://all-premium.com/user_file/files/saxudoriwaki.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/38388671807.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/walefevepazafepekepo.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/ninowebobenoxevojulokuro.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/sojulijik.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/94524771655.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/retisigeduj.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/jarusoxuwenuvodadere.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/38760852295.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/67893347194.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/bofologixopajenar.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/dibizafib.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/pebimemajozogumowamaxeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=peristyle+garden+house+of+the+vettiiPDF 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_off0000dfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 10912 bytes
SHA-256: df9bf5f9031ab38eed3484bc6adc66c6e23d71da6924526f4c7f1d4ea0caafc3
font_02_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 17484 bytes
SHA-256: 099e22b20c5f2e414bab530049ad734ff69cb7e2b35ebd9ef415a385383b6a6b