Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92306f3bac5158c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 04:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a411896e81e08dc504860290a6daa0fd SHA-1: d8d28280a2f164ed46026775b3c6b13d8a1f65ff SHA-256: a92306f3bac5158c70804c98a4d5b5d9ab9e177580798904987d5e9919afa9ab
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or attempts to phish users. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, some of which are hosted on WordPress upload storage. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

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://angelescare.com/userfiles/file/garaxomosigemubopezase.pdf In PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/efe45686d7e33e55874fa3b25699ec9d/7588509103.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/70400194140.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/eg8rg63j6gpkvodd57acp36tn2/rumuviwozaroger.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/zewitukosugux.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609df0955e46a---74102328596.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/434e7373a51b57dcf7dd6fa1986aceac/xafesoxudiridivan.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/48192732970.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7f66c696e6a541a057f6384447fab7a0/jumozepusixuf.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/9o074jeg6qsoadlnht2o00hlfu/luwomilu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a951f7c6389---88535674685.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tulenemok.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/t9keeigechclphietppd1fkaat/79753539956.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/18345474710.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5204141778.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815c93115cd---28529372321.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/d1v2iuhe3bdmd2oijstbeffer4/12857972643.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/81967561849.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a09a512be9---vemitamisoriposobezajefaz.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/chrka8b4i42n83t0p3mnp5ifj3/72940926822.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/23691983445.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/91992373619.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/98079566898.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/36324001477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mixed+methods+research+book+pdfPDF 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_off0000df5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 18260 bytes
SHA-256: 6c2458b2c18922642bd1382ebf602974cd5fa5a91d1fc61cbd75c807f5ae0fa4
font_01_sfnt_off00010e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2F 11060 bytes
SHA-256: 1158ec06ef32db264f6ad4836b70815dec0e49a6ca597fc2741ac89a034cec35
font_02_sfnt_off000127c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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