Malicious PDF — malware analysis report

Static analysis result for SHA-256 492de832b4d3154a…

MALICIOUS

PDF

93.1 KB Created: 2021-08-18 20:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bf5c0106aaac36977431f83d7d70d3c SHA-1: da5387ed68e454ac25b46bfe3a21c1025acb9aef SHA-256: 492de832b4d3154a99c5638f7e2659afa2f20a439f60926c91406739cf2a8d9d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://parokisantolukas.org/Uploads/userfiles/files/50033277708.pdf
    • http://shuswapladystriders.ca/userfiles/file/buwidibubapagevilabejoxo.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/lct1qt9arjqt1o3tj3404k5tfd/64951760625.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/577d6ea800f0f6af890a401574376d61/23180807407.pdf
    • http://hum-lucknow.org/test/fckeditor/file/pozasodijarifage.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/hn3b5ti2le53ei6m5mrg8kn1bb/tugavasipijatevivezup.pdf
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/nepanunumomonesogabako.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/5abbb13c85b8f6abae13f7201bfb4d72/barezegoxaziw.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a067789bb9---zigazoveketi.pdf
    • http://notariocprietoa.com/notaria/documentos/files/tejike.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d9d8ca0fe---vokivawumasobesetivirin.pdf
    • http://mizuho-co.net/file/ck/files/60007045109.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084df57a54e6---68674103783.pdf
    • https://kitapkaplama.com/upload/ckfinder/files/nusekaxuwekik.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/fd2d092c260576e5c76bb868dee4619c/26021855896.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ojmar592pv5qu9mql4vfmn3t31/zapunujoku.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947db41e48c---36046462822.pdf
    • http://ei-windykacja.pl/upload/file/5158598303.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/pu8q0sf19ms3kaododiejr3re0/39114152964.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/c92ad7ff6f17e7666a61988a88d2381c/33871031617.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611498959ebb4---61841897700.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/3fc54aa5cedeb61324eeb4cbac01cb50/2782830514.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/03a9d9a7f8bd6b740bc0025ef5233587/naximejanerevutu.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba15fe35b84---bezatevemerotujav.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+make+a+diazonium+salt
    • 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_off0001089c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1089C 16792 bytes
font_01_sfnt_off000120b3.bin
b3c761c486c576a80d9318bca0c21d399f41daae71a8c00b80f84c66553ad22b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120B3 10636 bytes
font_02_sfnt_off0001390d.bin
1eb78909f82469a87b8e8693c18b96b3cb88721cab77de9ab6defed82b8df923		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1390D 17580 bytes

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