Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd077844f5381b5e…

MALICIOUS

PDF

94.4 KB Created: 2021-08-25 16:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2a6bdfcf1a4c50f672b5dfa4f2ed9660 SHA-1: 88482f67cb8909dd8a6609fb1fbba1d1626864fd SHA-256: dd077844f5381b5e006c4f1f31d0c006fdb5a03ab57c9b0aa4e0b2c4d2dd5bb4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to compromised websites or disposable domains, suggesting a link farm used for SEO manipulation or to distribute further malicious content. The presence of these links and the overall detection indicate a likely attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=elementary+statistics+chapter+1+practice+test PDF link annotation
    • https://www.nitdgp.ac.in/uploads/userfiles/files/80060982809.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/gofakilubofugirap.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/subalafobiturewiwu.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/7199588985.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609561b93a786---47344231131.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/18acede3208c40729b8f85fd1b0a5f8c/20186490978.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/579fbcf158c55f06f67bce0cd2c14e9b/pavovidewavorezivam.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/womugaxufifuxafane.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/munadibewumezumasozeza.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/sagarudiwekawor.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/74408946848.pdfIn PDF document text
    • https://stvorki.ru/files/file/11786403699.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161032aef5a44e---13142407436.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/wepitejexosuzabofikusoji.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d2971157a---nenin.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/gemurufusesap.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/16239670015.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/85530101225.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/k899j0attreue5mbobmi2cq6o8/2571136977.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/wezewab.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c15c39aa6a3---36605656501.pdfIn PDF document text
    • 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_off00010ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C0 10668 bytes
SHA-256: d6f38f7c7eb73e6a4fd513ebfee59ad85f882d60099bdf54b378e05ab08aae16
font_02_sfnt_off00013c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C04 17160 bytes
SHA-256: a8f6c045b0aa0ed561e6398cbcc74590b2976fcaa90c20bde782e34206e2e57d

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