Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba0c493ddc7d3371…

MALICIOUS

PDF

76.8 KB Created: 2021-10-02 02:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ebef0e4c5170edbcc1485cba0420ce9 SHA-1: 9a9afef71173493da4054947283483378903e298 SHA-256: ba0c493ddc7d337129355e7b2fb16ef8d7bc46e144c643b9d17a3df4b89a38eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://krisoc.ru/uplcv?utm_term=microsoft+flight+simulator+download+android PDF link annotation
    • http://evopizza.lt/ckfinder/userfiles/files/wolexuvuzok.pdfIn PDF document text
    • http://daliangluyinpeng.com/userfiles/file/fodekigadalimirajinidos.pdfIn PDF document text
    • http://showdoimovel.com/files/files/99061558555.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/35806649159.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/vilokokexotubetomu.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161315cddcaa45---fevanovovuguje.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152b14af19f3---21212236075.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/zuguputepugisebosi.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/23794151728.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/pabixivug.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/filozizatolunedusaki.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/73296073556.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/96534981295.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/78559188312.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/57059851781.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/85180383811.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614485ec5978f---bafivalanalurujotar.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8f8f94237---sexidejoferilave.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/numom.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16157825e52d83---74485680407.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/fasawemuzawuvomudaki.pdfIn PDF document text
    • https://melz-feu.ru/upload/sadomuxivuluzafujejim.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/gadurojatokapunebigonopi.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/dozarix.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/8573245523.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/61728303718.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58865638672.pdfIn PDF document text
    • http://aweibel.com/Photo/file/89366691427.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_off0000c5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F9 10968 bytes
SHA-256: e2485c93a9fd27ceff867c128b30ebbd0666cbe1d75e4f7ec901e691c485c7d7
font_01_sfnt_off0000df1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 17676 bytes
SHA-256: 69128c2ed845c9d6ca699c818ef5b848b4f0298ab4c6309a5f967d24aa6a6ee4
font_02_sfnt_off00010c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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