Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b11d0f20bd7455…

MALICIOUS

PDF

118.8 KB Created: 2021-07-20 21:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 558b1f7b4c3b15a9cf576dc75d4ad613 SHA-1: 597b9f908aacac2d711d6ddf81b4f2a7c691b932 SHA-256: d4b11d0f20bd7455b6e6df1ba4ab1ac7194db01ca4f3676fc421dff2c0f9a76e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d3989c27209---wedidobuwefadatibosi.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5cb3413e8---wunujadipuzeluluvi.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a718a7d53ea---ronexelovosakaj.pdf
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/xotalikekusajop.pdf
    • http://minhphucvietnam.com/uploads/userfiles/file/mulatimatezodavaxiz.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de8a077cf0---64116742093.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1653ddbf6---22346765557.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608130189273c---42737862528.pdf
    • http://kbchina.de/upload/satotoredotupawoj.pdf
    • http://buchtel1967.com/clients/26382/File/26901323509.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/zetugebimurekupoxaw.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/cllml3bif2gnk0663aftjneb43/jijegixaxoleg.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8fa65f642---takexuwapiwerewibutow.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/89ee5de9380ae966e35f1299bd6baea0/41553961807.pdf
    • http://aarogyamedico.com/userfiles/file/bepiretaxipofidenanot.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9db56e5bf---85775234105.pdf
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/hf66nv9cifdfjmst17o4s3i0m0/nawesume.pdf
    • http://allamericannursing.com/userfiles/file/xozoligetiwotidezutaf.pdf
    • http://alituncer.com/userfiles/file/zalam.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160849d1ea6f97---86993117725.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a6a3c02a---41048925513.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9db79a6b5f---20800686567.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/abbfedb701f46ee1e47b38ef6b9af29f/rifoga.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160da273a49427---jaguxakoguvimozokuri.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=to+have+italian+conjugation
    • 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_off00016bf4.bin
da5acbe15942d4ba7173a6fd157930155de6125f75daa31d31e8a3fd30f3b4ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16BF4 10500 bytes
font_01_sfnt_off000183c4.bin
a394d6630b060e3cf668ad319887247a9301e81cf081dd25b0a673fbb9a9be5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x183C4 19380 bytes
font_02_sfnt_off0001b584.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B584 16792 bytes

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