Malicious PDF — malware analysis report

Static analysis result for SHA-256 199f7d25b327d105…

MALICIOUS

PDF

71.9 KB Created: 2021-09-13 17:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7908d3798599c58a505266f97518a7f SHA-1: 5956ad4d108d86ba91236cd865b3c158966cbe6d SHA-256: 199f7d25b327d105e09e63802f93287f34dffc18f9c020821dc4e0fb3ae17217
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://euforbiabulgaria.gbinvest.net/uploads/pages/files/likedepazukav.pdf
    • https://htcpost.vn/vietpost.vn/img_content/file/numigufuvarewarinanoxol.pdf
    • https://laps.pl/userfiles/file/natupit.pdf
    • http://abw10thstreetne.com/uploads/files/gewopolubumijevolumuza.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/97bq95f210gn7cghp68fk6era3/41652212901.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4d8351bee---85080831252.pdf
    • http://idolyokocho.com/js/ckfinder/userfiles/files/98727086672.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320ade5923c---mabazerapomobewajevavu.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a52ddc12e052fb6337917f3ebd3f7ce2/82654945489.pdf
    • http://panteres.com/files/files/78255091456.pdf
    • http://terredellamagnagrecia.com/userfiles/files/dubamawoveba.pdf
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/5807294271.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/193cab8a5fa6dbc9e97af81f3c2d914e/9637215592.pdf
    • http://getvisa.ru/images/File/93218069646.pdf
    • https://aksusu.com/upload/files/47146966693.pdf
    • http://gonvvama.net/filespath/files/20210901233106.pdf
    • https://ksi-system.pl/editorfiles/file/70342857342.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2c1951302---95876582104.pdf
    • https://hiroyoung.com/data/files/67383125279.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161313d9342f0d---denuneseromerelole.pdf
    • http://hytechplus.com/userfiles/file/sujimotesuvipivope.pdf
    • http://yuqiaohome.com/uploads/files/202109052152235580.pdf
    • http://bjhtdszdh.com/v15/Upload/file/202194172295914.pdf
    • http://lasermedia.cn/userfiles/file/57851843637.pdf
    • https://grandegroup.net/files/zakipalolosebenijo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=apk+summoners+war+lost+centuria
    • 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_off0000b5a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A2 16792 bytes
font_01_sfnt_off0000cdb4.bin
80f9f06954e317629ea99d0957ce955ab25d016767a1e1ac3620f44a8d6ffe5f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB4 17228 bytes
font_02_sfnt_off0000f924.bin
e1a98262a084194916a24487a29caa766c4341cda75c4b64fab124d7d39e7ac3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 10796 bytes