Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c2b50cbf24d16e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 01:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 233b41ca1c01539aa821d263c278137d SHA-1: 8f3b38f13b33ab83c6ff881b151fe7482e4ed0f4 SHA-256: 63c2b50cbf24d16e3b234133347a9b3293514c58ef0a073b8bb10301da0fbefc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://csc020.com/userfiles/file/20210905120505_axv9cu.pdf In PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5e6a0db2351227aa728d54abb4cf3c7f/57206527938.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/16554135391.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/taxobo.pdfIn PDF document text
    • http://greenbrier101.com/userimages/bejetasibipojifosafi.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/74798048173.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/nivowaxur.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/jobuvopeporu.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/pitawedizudumadurajupo.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/93211708641.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/fazetufolijepupadebogexij.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/1155650815.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613082985b244---35144537662.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/defitutukep.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/kuxez.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d008813827---13890349369.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/nuwam.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/76960033194.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/foguxebebukodurafifidulu.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/35890276075.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/57942843694.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/28994658468.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/h815bje2tuscpiutjmrdladotv/55366663068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=videoder+mod+apk+downloadPDF 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_off0000dbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB3 18656 bytes
SHA-256: 43778a3b45919a626cc543e3d7c22d63649d4c16093d1f0d6f9fbe188483af1a
font_01_sfnt_off00010cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 10432 bytes
SHA-256: 393404e14876e89728d4c08e0c84a47f6322e7fc6b99b80595f86fc11ee16827
font_02_sfnt_off00012445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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