Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d428a81266dfd3…

MALICIOUS

PDF

69.5 KB Created: 2021-09-08 07:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d65425ff91ea76c2e7d4ae733b5f3048 SHA-1: 438739dc5392c4a98dcf7ae07183f76e9ed66487 SHA-256: d2d428a81266dfd339a0bddf2fb2d20cbce4fb29ae91c41b8b200e5660ff2926
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate these redirects or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://asea-admin.com/_userfiles/file/20210502222927.pdf In PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/43074588771.pdfIn PDF document text
    • http://haki.vn/uploads/files/55095807266.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ad48361e---71480668357.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///vewuvawodebezoxepidejunuw.pdfIn PDF document text
    • https://alutat.com/data/file/marodosuwiri.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/nimaburixajojovagaxini.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a58d491fba6865288202865abd885c87/sekomenu.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/vebon.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/lewomi.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/losuvisaf.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/jha4m59d1tacp4d4rlm328bo5u/84759098935.pdfIn PDF document text
    • http://halaljones.com/uploads/files/litev.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfef5cb757---29557300048.pdfIn PDF document text
    • http://kag.fr/userfiles/file/33604152329.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/80281388040.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/306fb4e59a54d5d9c34b4b862083c4de/luviline.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160ed5c8522227---tekiboramu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f26c2e6239---lanobewegusedowasotexudum.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a4251ee50c3857f9bda27d5ec28a1701/komubarizozu.pdfIn PDF document text
    • http://wawa757.com/uploads/files/6762606043.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/wivibasenesefeniludupidel.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/bavorixeza.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0fe6553b---lisetowifixox.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/55889048634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=quantitative+aptitude+questions+with+answers+pdf+in+tamilPDF 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_off0000b261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB261 14504 bytes
SHA-256: 3c02232b6b025ed69d9e9639823fd6fa5f303536b8f74a7ba93b57ddbb22b939
font_01_sfnt_off0000d61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 11220 bytes
SHA-256: 13272a3193167e3108cf945c0b23c3877f5445cd5f68848ad54e42e394ed14f6
font_02_sfnt_off0000f022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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