Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83ee41f3aea0bc3…

MALICIOUS

PDF

69.3 KB Created: 2021-10-12 02:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 7ee441bb0707564d654e78293888f14f SHA-1: 3f132377317b31237eda2cee3594fe7fa5df5ce6 SHA-256: b83ee41f3aea0bc3a0bbccd9a9af6c085488b2f6c2ffec55e8267787bfd9357b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external URLs, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://www.rapn.ru/ckfinder/userfiles/files/34978434619.pdf In PDF document text
    • http://coiffurenais.com/userfiles/file/60610471704.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/sebabasegoninepasadi.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/73111959406.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/76919377366.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/35719171425.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/44288766615.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-25/20210925152005676953.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161557b4d5b587---70233830770.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161324e07a42d5---12208237577.pdfIn PDF document text
    • http://okvin.org/userfiles/file/vamanixofef.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/23498534935.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/larenolodozivuvesutipire.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/wegivuxuwen.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/puxavenijulonesololix.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/15201845094.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/7e4098e1ae37c06a593159f20d0ab5c0/duvilukonomupurufomabok.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614040c13386a---bodoselisurumolikugat.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/pegujejom.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9281fa4af2de715779bc8488907c1cc7/bapedesesusavujafoduvu.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/95332796298.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/48606960626.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1633158191.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/47719535899.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/869a80ceb39ed24a1f2dcc32c692730a/22601529874.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/rurigonowubevetefagimara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/EqozwcbAC44/uplcv?utm_term=2+pints+equals+how+many+gallonsPDF 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_off0000b1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E8 11068 bytes
SHA-256: 7b7d05064aee1e35a55024a08677e04648f48095cd99488aa7a290e8d7d05992
font_02_sfnt_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 14504 bytes
SHA-256: ac9ee0c99f039942bcb9edecc4dcd97a3ee386223a7dd931e5d9e5a89c59712e

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