Malicious PDF — malware analysis report

Static analysis result for SHA-256 88192101cef05bcb…

MALICIOUS

PDF

89.4 KB Created: 2021-07-07 12:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47c0f3ddb1f0d63320da3b9d66fb5b3a SHA-1: 84f3d3df305082453bbd884922a2aff93fa70835 SHA-256: 88192101cef05bcbcae8f11e0a14a66d05514096bf2d8af76fe311794c33174a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised CMS upload directories, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/33773975d0fcb295a3de5d4ab491f880/9665976422.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/e95c01b1ca1df121ac53096a74b13c67/72446470990.pdf
    • https://philcoastal.com/ckfinder/userfiles/files/lulamokeki.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c48fd1ce052---jipogidebobo.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96e1ddf23---67297033472.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e000be52a12---negupigovosotozinevem.pdf
    • http://agendaalzheimer.org/files/galeria/files/tegapiban.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fade536b5---74593799347.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b0669b907ce9898e1fb0d750117d514/24607552104.pdf
    • https://equator-maritime.com/userfiles/file/25872449491.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608137ee45e0d---resokadakid.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772dd2b2950---21608627352.pdf
    • https://szud94.hu/img/sajatfile/files/34840548092.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ddol40p5nm908jv6uv31sr3um0/dadinaropajosakuvik.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/85cc24033286eb82cf56c8f48c78363a/18588709036.pdf
    • http://ipsgroupjjn.org/userfiles/file/34592582992.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/da533680177d61b8f49a4f64f1ff4401/40247589192.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c33a0d4b4d8---63589428096.pdf
    • http://dailymaytrogiang.com/userfiles/files/dupiledajapobapotezevem.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ca51b1fb---37862428568.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcd6906ed0---xevugaranu.pdf
    • http://geometrabottero.it/userfiles/files/45843795607.pdf
    • https://adepotcustom.com/UploadFiles/file/20210517164828132.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/r9bkrs2t5qu4d4jk9g85erk5l3/kituxirefa.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9c0gq6ff1ad8u126a6gdccpmms/63895270219.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=watch+free+tagalog+movies+online+my+amnesia+girl
    • 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_off0000f869.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 16792 bytes
font_01_sfnt_off0001107b.bin
f1fb0a24caa7a45aaa44ee6587cd073d9bdfe420d2be10d6a1ea5668bac0833f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1107B 17528 bytes
font_02_sfnt_off00013ea8.bin
e442770812d1b11287b4f1c16959127e8e46281cd01c9f3a70063fb654e61697		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA8 10956 bytes

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