Malicious PDF — malware analysis report

Static analysis result for SHA-256 50cfe126d5e86aec…

MALICIOUS

PDF

83.9 KB Created: 2021-08-30 09:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 816c30bba0fa71daaaf97e710d6bb2de SHA-1: 323278e89c8343557e66b19f1dcfa5568932f016 SHA-256: 50cfe126d5e86aecb6864eac387b3bdcc292796639a065faf5fd0c7faaaf948d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or redirection scheme. The presence of embedded JavaScript indicates potential for malicious code execution, likely to facilitate the redirection or download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://btsoft.vn/uploads/files/69971105953.pdf In PDF document text
    • http://propellerclubsandiego.org/uploads/files/60527975379.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/gajonagafuxuve.pdfIn PDF document text
    • https://bselink.com/userfiles/file/26966613955.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/boroxiwifujuxugelejik.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/13515973955.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/85373141579.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/vck1ds2n5e9m9tk488fi2otghl/55846908059.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5fb5d6c572dc1a0680c028137a4d2a3a/golurodixexuk.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a710ab0a062---65759258151.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/xowamedoxidafa.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/gar3mq6ug010e3mq3af8vtgfk4/kekasifazuruxujesa.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/nurizinegawizufemaliweweg.pdfIn PDF document text
    • http://idcla.net/upload/files/zurawudosepafonajopi.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/37677263368.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bb67b70e5---47482060858.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dcb216302a7a9665b292d058da1fda40/76323276900.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4cc5f07f8---lizefo.pdfIn PDF document text
    • http://flgr.ru/files/files/naduxuzukijetatizuginum.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/e823be203563296368203d50f224b52d/41359001114.pdfIn PDF document text
    • http://erictex.com/ufiles/files/81991239206.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/2613851718.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161050d1419b41---giretavonozugazi.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d10f366e14---zorexorofutavarowamomijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=may+be+meaning+in+englishPDF 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_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 10484 bytes
SHA-256: f961edf61cd187283e3edeb2ef4648176ef5b85bf47d53dca5cd7aeaa74ed0ea
font_01_sfnt_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 18060 bytes
SHA-256: 6b2b0bbd50fc67b6d597220d786e4656f7e4c57daf3df4ad7accef982715df48
font_02_sfnt_off00012886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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