Malicious PDF — malware analysis report

Static analysis result for SHA-256 297320daa52cbf6d…

MALICIOUS

PDF

83.9 KB Created: 2021-06-27 21:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 022a5005ab3c3e18a8b824233783692f SHA-1: 74335357c024f2243dd2a0ca1c2e667dc2afc2e8 SHA-256: 297320daa52cbf6da3968f40c92d601bb39f3c664a99c1e0e0911cc7f2bd6f1f
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 WordPress sites, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous external links on potentially compromised infrastructure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/7dd3c1c6c0bd69635c349e58a20e8432/55273184558.pdf
    • https://prcomponents.com/ckfinder/userfiles/files/94937096412.pdf
    • http://ekolojikweb.net/upld/userfiles/file/boful.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e52dc97fe3---49073780800.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/f2c4a1ca1051d3d26ead6cf8578ed241/selamurotinibir.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160976ead23193---sazilu.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160815d78ae15a---99364313025.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a6593aef43b---pukopikinoboxikuwe.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/d57a6c22dcadc7d8f2f373f133b46526/koxidajinagavufuveze.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/1f2f96bdc6b0d8c193b24b732f6196aa/filoluvolowi.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff2eed8587---32023446407.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607991ac5e16e---sumuvamisoxitanulo.pdf
    • http://fresh-j.info/images/uploadedimages/file/59533610985.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/mocbg87um1lb2sv2v8sg61qvv5/daparepafepu.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ce177208dd4---53672059683.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8e43ef286---68243641806.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b297376f1c6---17964518258.pdf
    • https://serka.com/serka/upload/files/76364195692.pdf
    • http://paillasse.hu/userfiles/file/28083133715.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607119f860c8f---88843775158.pdf
    • http://villa-carlshorst.de/sites/default/files/file/vetonox.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6546b0e6c---dejakonekusexuvokonifivi.pdf
    • http://elementsgogreen.com/userfiles/file/fakobedigujapejupexunome.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pdf+to+word+editable+converter+online+free+without+email
    • 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_off0000e533.bin
7d313a594a1a37dc083de36e504ef706576b494d3344554daf7880d7fef1f544		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE533 16720 bytes
font_01_sfnt_off00011077.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11077 16792 bytes
font_02_sfnt_off0001288e.bin
f896539e5d20bf991b8e40ef980014e7b714737643ffc1a3844e471f0dca6d4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1288E 10968 bytes

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