Malicious PDF — malware analysis report

Static analysis result for SHA-256 9612f3828b63eefc…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 20:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7438f6e72b7902969bf6580830df8ed2 SHA-1: 8c925c02ea2b79c68b4a31be2f26f177740365be SHA-256: 9612f3828b63eefc30694ee462451e8b07f6a0764f8bed3da65b49baa2855ee3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified embedded JavaScript and a link farm pointing to multiple external URLs, some hosted on compromised CMS platforms. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=i+saw+the+devil+watch+online+english+subtitles
    • http://ramenhajimetustin.com/uploads/files/watiwevotof.pdf
    • https://phatgiaolongan.com/upload/ckupload/files/bibotusobidiz.pdf
    • http://vietsonplastic.com/uploads/userfiles/file/78477088781.pdf
    • https://speak82.com/_UploadFile/Images/file/mibajudit.pdf
    • http://etkindenetim.com/resimler/files/13907065367.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fca03a2dc---86536033987.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddd69be33d---45758337139.pdf
    • https://dichvuhappyhouse.com/upload/files/7927983041.pdf
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/ziduzatadurunajixufena.pdf
    • http://tavio.su/files/file/97056041455.pdf
    • http://bk-plus.at/userfiles/files/jedefumopi.pdf
    • https://by-express.com/upfiles/editor/files/warodoxelenofavapaxef.pdf
    • http://flygarfield.net/userfiles/file/lojisaxilopoginuzif.pdf
    • http://exosushi.com/uploads/files/9703061381.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/virimigevesapizozop.pdf
    • http://www.psoealora.es/ckfinder/userfiles/files/18113079451.pdf
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/56758104455.pdf
    • http://poliinc.com/upload/files/taluzidu.pdf
    • http://mikailang.net/userfiles/file/20210901103536_402117125.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/rca7dlj7lq10558re3mtsk37bo/76652915317.pdf
    • https://hinodecoder.com/userfiles/file/18505800224.pdf
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/gukus.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d977.bin
efe70d7df6fdfeec063dffa23b1b8ce4d8c0e15955bdf60d47acb0b2d85a563f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 10892 bytes
font_01_sfnt_off0000f278.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 16792 bytes
font_02_sfnt_off00010a8a.bin
8ad0e37ba78bfacfc9afd73a3929f6f53883fd03389bdbaf4ec917930e715ab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 16508 bytes

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