Malicious PDF — malware analysis report

Static analysis result for SHA-256 b069bf6b4a056677…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 11:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 101a94ad96b48b83888ff722ce577127 SHA-1: 1b7496faa16e7b3e5f1e1e0ea26a6d4d188f3741 SHA-256: b069bf6b4a056677588a6e22a65347593d464d684592fd892265318f97c791ce
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs supports a malicious intent, likely for SEO spam or to distribute malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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://abwnickersonplaza.com/uploads/files/wavopixivemopodovitu.pdf
    • http://onfireinteriors.com/userfiles/sekoworibonominag.pdf
    • http://meetburgerusa.com/uploads/files/voviwevujexolunexil.pdf
    • http://knipia.com/userfiles/file/mopumapitok.pdf
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/kasikufakofepeko.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140614f428ed---xejonesudukizujogovasukel.pdf
    • http://jjw-led.com/userfiles/file/94328085757.pdf
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/9118607687.pdf
    • http://siamsankyo.com/Uploads/file/vagosonisuzanovikire.pdf
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/42453756970.pdf
    • https://matricula.netlandschool.cl/files/pipimupafoterix.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd0d590b4---kazegalijazipekoxoxavor.pdf
    • http://agcslohian.com/userfiles/file/gawedovade.pdf
    • http://growlink.biz/userfiles/file/84471428807.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ea0b8d43a---nuvenowevakowu.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161414908e8678---80873662277.pdf
    • http://fairfresh.net/assets/admin/ckeditorimage/files/lesixabupovalafaxek.pdf
    • https://negaratoto.com/contents/files/lotek.pdf
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/14719575740.pdf
    • http://sushikyototogo.com/uploads/files/18761028317.pdf
    • http://eastindiaspray.com/suvra/eastindia_spray/files/63743356262.pdf
    • http://ychnjl.net/userfiles/files/merenibavanosenetupowo.pdf
    • http://mamtaniketan.com/userfiles/file/wofulikofi.pdf
    • https://vannordenvastgoed.nl/userfiles/file/xibetodeparugako.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+do+i+make+my+keyboard+bigger+on+my+phone
    • 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_off0000d9f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 16792 bytes
font_01_sfnt_off0000f20b.bin
9a7d732c53a44dc3c3ccb1de648f50065b28828357945581a8b4461d1c620095		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 10952 bytes
font_02_sfnt_off00010ab8.bin
047f34f6e7be79ca3369a6cc95987cf2ef050ac58692eecf939f7e123cf6dbef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 18044 bytes

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