Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcc65153f48f913…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 17:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e41fa39fab034bac56e70d3267eeccf4 SHA-1: d885f7456c9b1d4cdfba16897f9b63125662b7e9 SHA-256: 4dcc65153f48f91309ee5837b8e018c12f493ca8ac092b783cadaed97f3b2f3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pixomot.ru/uplcv?utm_term=designer+city+hack+apk+download PDF link annotation
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613792db70981---44331879490.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131c569c091c---jumetanibo.pdfIn PDF document text
    • http://innotack.com/userfiles/file/42338449953.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/desufamubodiz.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/46aj7r3pataeh0p9q8mmmhu6k2/rejewuwuxipafebabuz.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/dp7j8unpatvbkqphvdpuslpv0o/zijumubof.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613148b88aadf---noxotojaluxabokaka.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/74203255635.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/dunajufawojazobosobopike.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/16047725454.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/lisajetupasabogebimew.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/xolunizavedegisolexuru.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/sazedu.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/gotave.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/6344654430.pdfIn PDF document text
    • http://staropolski.net/Upload/file/tetulapasu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613414d3e854f---43237747972.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/jotit.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/fotunaladuxojifinif.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/dosilatoso.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/xozapiporamuzegobatiju.pdfIn PDF document text
    • http://wwstationery.com/files/file/loxozajelidatamubogurazer.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/37505665781.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/62933272226.pdfIn PDF document text
    • 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_off0000dea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA1 11088 bytes
SHA-256: 711b148e3b5f0ddb58f82095ab8a05883e9055507be2a4fe970b69b351b58530
font_01_sfnt_off0000f853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 19304 bytes
SHA-256: bb4f1ade121a6ad1b1f8c2141e29d2ff1f381fe6c3295c6a6b175d7cbf49c619
font_02_sfnt_off00012a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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