Malicious PDF — malware analysis report

Static analysis result for SHA-256 deea9c2149944e54…

MALICIOUS

PDF

88.1 KB Created: 2021-08-23 13:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0c84a0a09d08e1e6c6a535b0dc2d5cfe SHA-1: d29772c673b72eb5a0a4844edd8afde7b707b3a1 SHA-256: deea9c2149944e549946b88a381c5c60b4267410415e5b08e3a77d3fb5594f3b
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The heuristic 'SE_URGENCY_LURE' suggests a phishing pretext, although the document body itself is unreadable binary data. The primary attack pattern involves directing users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/770964092.pdf In PDF document text
    • http://adamslakeband.org/userfiles/file/36447286826.pdfIn PDF document text
    • http://aweibel.com/Photo/file/tonebiji.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9e8cb6acd---jexoromavuzitajax.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160995caf9b72d---36534948761.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/gulorewadetexavoli.pdfIn PDF document text
    • http://hasyo.net/files/file/19932347941.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/rizidesodiguwodikij.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/66236217809.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084dbe9442b1---piguv.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/40180223930.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/55636a463bb80e56580128dd4e4e5b3e/63160424571.pdfIn PDF document text
    • http://e-district.org/userfiles/file/79479721287.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/libarukobirotepib.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/10610491407.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/77764782405.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/jrdiugmf0uaoio1bothnimasiq/povevuvedilufifakega.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/daberunagekexudoxusujov.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/bazanubox.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/mubisof.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/56465331659.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/amvh609j5gdrpihbme1kb10ror/pazitaxisodebeguzeru.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/39122245239.pdfIn PDF document text
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/datoso.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/mimubekukosa.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/365638991c78aedd97ff59ca02a46c82/45287296779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=bece+2018+mathematics+questions+and+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 17444 bytes
SHA-256: a68ef216322a838492c7e01fae748af7b3aef1445f91164fc5a41eaa10c5a340
font_01_sfnt_off00011e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001364e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364E 11476 bytes
SHA-256: 65c1f503caff3d40d34f75e290057cb7c5f99c270bc53ab620de516f49c2607f

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