Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0a73dfbd9b071f…

MALICIOUS

PDF

87.4 KB Created: 2021-08-19 09:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 063de1fd25993fca287077a087a098ac SHA-1: 8cb9115e771aee23554494dd43a1a2109e4ab394 SHA-256: 9a0a73dfbd9b071f07cf73bc07ddaa80d31ba0b7a49f377f3a5383c2b4eaff55
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document employs a remote-support tool lure, instructing the user to install or connect with such software, which is a high-risk activity in unsolicited documents. Additionally, it contains a link farm pointing to compromised WordPress upload storage, suggesting it may be used to distribute further malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9883

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/74e417d7d95d5955d5151fc8036b265e/rurumuver.pdf In PDF document text
    • http://finemetal-cn.com/upload/files/tevopilekufageduvuxuli.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c5601299cf5048a8e48982a46a389430/tevujupanoludo.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/37483591797.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7ng3mg8rdl4sondic6b9d4j283/83690193064.pdfIn PDF document text
    • http://altinellerinsaat.net/UserFiles/file/vabaralulun.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160878313cd02a---tabif.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/k0jdurbum7j5rb5hpjm5q4pqmb/71271442913.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/gamisozosexowabi.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef44768aa7---vagelidap.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/nufesitopojezoferazo.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/kalasumi.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d839a6214---balaxagewemisok.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/59391778435.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/d0fd55dca54f1a3a05c972c617241352/dovuzosokonubunoro.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/147a0bc0455e0b3279256833b1a3ec7b/dopugejovifipafudumamiw.pdfIn PDF document text
    • https://inncredel.com/uploads/87417595179.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a15ff3f7a5---25947178640.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1611cef1abd2b1---jojasikadawibowozisilo.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/it2taqp87qd4afpg52dutf3br4/popogetarefibogidujaguna.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/kaxufirasopukuxu.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/69873380298.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/xoxutabuxudugapajaji.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/97369929792.pdfIn PDF document text
    • http://allycatering.com/userfiles/jupotefab.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161113960d252c---23937664201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+turn+off+closed+captions+on+tv+remotePDF 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_off0000ee18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 18000 bytes
SHA-256: 48a9966f81a4457429a1e42e08510066127166e6b5f2e0cc5e49ef3f8d14550e
font_02_sfnt_off000134b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B3 11024 bytes
SHA-256: 66e38e47997be02ad5c861a434f88d37cfdd8e3d7270396f758937a490a0792d

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