Malicious PDF — malware analysis report

Static analysis result for SHA-256 7498c29f850cdee8…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 03:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7dd8f898facaa7e7f22680d5aa5ca16b SHA-1: 5b76143690dc18e181d135ad9e74c91fe56cc59e SHA-256: 7498c29f850cdee872f482b1dda288a900962a7035f8240862b8092c5f71fdfb
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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
  • 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://cesarrodarte.com/userfiles/file/doduwifolebepabobasu.pdf
    • http://dgjinhak.kr/DATA/upload/files/202109211201059028.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161437c51492cc---48459873442.pdf
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/vowodoxofinifotokifo.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/7ed1e0e9008da17c7fd22ad6fa20e810/tomunijodonomepurawaf.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/349efa95279a31e7020e490c0c9944d7/vimutesibekasudolugiputu.pdf
    • http://ersatzmonitor.de/userfiles/file/rexixizaguleki.pdf
    • https://km2804.com/ckupload/files/38484762809.pdf
    • https://togelunited4d.com/contents/files/naruwusinijofesupudebejew.pdf
    • http://collegium-connect.nl/ckupload/files/xutazomekirutijifogekuzup.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccb4ab162e---34370875795.pdf
    • http://imobiliariaimperio.com/files/files/52189042651.pdf
    • http://thanhtindesign.vn/uploads/image/files/92030630604.pdf
    • https://internationallanguagenavigators.com/media/xavib.pdf
    • http://nutranghongngoc.com/media/ftp/file/kidibedilefunesimabinab.pdf
    • http://wisdomtours.net/upload/file/lamibigamerijo.pdf
    • https://adikkedua.com/contents/files/radenatiwidupejowosi.pdf
    • https://pastravariaizvoarelebratiei.ro/images/file/65197501616.pdf
    • https://rajakedua.com/contents/files/30524929849.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161488c502ee58---jiwararoboneruzudujotokut.pdf
    • http://abcbyspu.net/ckfinder/images_store/files/tejunidapag.pdf
    • http://cbcom.eu/ressource/site-image/files/fumanoxusamekud.pdf
    • http://files.ibiza-ferien.de/file/fadoboluzogutore.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pubg+mobile+apk+only+latest+version
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b257.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB257 16792 bytes
font_01_sfnt_off0000ca69.bin
0282c2c1d51b1494f406532724a3447b2fa56af719cb70efa70eee2fc0a2d270
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA69 14996 bytes
font_02_sfnt_off0000f02e.bin
c24fb5b236e77abeff5c765e4e36ee6ca6af99bb1a4296be9264ec8b7f4e0c28
pdf-font-stream PDF embedded font (sfnt) at offset 0xF02E 11108 bytes