Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b8dfaad18104a4…

MALICIOUS

PDF

83.8 KB Created: 2021-09-10 21:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fcbda60c84ffdb104c4a8dca6e9aeb6b SHA-1: a8c0d9480fd26801d3fe0fdce0ef9098c92c2d08 SHA-256: 05b8dfaad18104a41f507b395f6218ee00dd2896541f1a48dfa4351aca235918
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, exhibiting characteristics of a social engineering attack. It functions as a link farm, directing users to various disposable hosting sites, likely to download a secondary payload. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to host malicious files on potentially compromised or low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://zsdbiopharm.com/upload/files/86652404629.pdf In PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f0b1356c0e6ee5bc36048ff7edea0002/4799569818.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/zenavejef.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139de4d18194---61782219277.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/53001490027.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/56235627748.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/99996744872.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/jerewewuwuli.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/2fc2969ef84c946a068126033cd552c4/xeradinoluma.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/62395029553.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396e8398cd2---lojuranapuputabi.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/85224011203.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/48849537358.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/pezekewobetixavozafe.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/58153195056.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/48770610216.pdfIn PDF document text
    • https://network-italia.com/file/94858736352.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/ranimakazivamuv.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/zobogosorafuxaditovorefi.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109030934483381.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/66923727824.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/35582269268.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/5988961056.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130f2468c1bf---vuvaridosevukokodufilub.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/svtp3ng076nlmtfuclutesnjem/terupivavokapuzobitezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=android+device+manager+windowsPDF 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_off0000e14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14D 18764 bytes
SHA-256: 771633fe2b19212d49bd1aa6f136089012a7d6f04f66cc2d0f37561b1ea6a1b4
font_01_sfnt_off00011152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12969 10704 bytes
SHA-256: a89488f2dfd77870783e5095e020270fbe96a0e5f18e4991c3fe0aae944c75b8

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