Malicious PDF — malware analysis report

Static analysis result for SHA-256 378e2a2eb2b190ff…

MALICIOUS

PDF

77.7 KB Created: 2021-07-21 01:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 925140ef7d1fc43c1ce3105b89122508 SHA-1: fdd31f5f057b5a3e41fe3a4a828fbf59877013a4 SHA-256: 378e2a2eb2b190fff6fc435c7f7f4e5e287fd1d5089f474450352e34fc238bc8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this, suggesting an attempt to distribute malicious content or phish credentials through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://acronimocostanzo.com/userfiles/file/filegutamuwu.pdf In PDF document text
    • https://accuratesearch.com/userfiles/file/79196126561.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609653ae72ab5---lanaxikidifape.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/43757381857.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c017aa4a9---nepawumitetaroriri.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/50323254526.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16098587eeb7cd---71964699162.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/mipanalitibipukutamawabe.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/83750774151.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/3574407054.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/9h7aserc92udb6t14mekq9qo3u/refufanatepumaverebifeje.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/93097529330.pdfIn PDF document text
    • http://halmar.info/userfiles/file/zuxunevobusoz.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/8762371206.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160719906df888---48502739019.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b29bcb554b1---bitubedugiduj.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794e10735fc---pozuzudadoxanigigoguped.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/xoxulow.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/rizozumexozurujixat.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/240cbfb6462329a00c03bd6b298245e5/30515546078.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec412e39a71---larekapuxuwixaroz.pdfIn PDF document text
    • http://ramsteinroyals.com/clients/e/e6/e68fa2bc61b75b8a06766e25905052c7/File/gepikufironewudo.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/3ef8cf710cce55f35c35356b9f3a45ca/75789386013.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/injghnqc9j85nueaga2r8lrcm7/zodowidugira.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/99135363489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=district+hospital+balaghatPDF 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_off0000cb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8A 16960 bytes
SHA-256: 2c5ba679ef8987c4c11231fc1a9120e9803fce5b2e9f01d47463e3d43ef43c87
font_01_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 10556 bytes
SHA-256: 772ae4e1706fde40df8de46342a507314b8d945f3bd8b0f37374c544a02771c6
font_02_sfnt_off00010ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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