Malicious PDF — malware analysis report

Static analysis result for SHA-256 6054d48c818914ff…

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 04:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1fc951e81800e324a4ccdeeb4457dcfb SHA-1: f76a125bf3b1dd14907ee44b51761f3213d8ad87 SHA-256: 6054d48c818914ff09113dd7fe29cdc1dc7efe7d1692540b1f64c2f5ba681721
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to exploit users via redirection, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medvor.ru/uplcv?utm_term=sink+in+tagalog+meaning PDF link annotation
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/bc34e574cdd83ffdbe695c8a70af07af/28972994827.pdfIn PDF document text
    • http://strandedtattoo.net/file/kekavufuwipije.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f9480c8ee---xevomeberufi.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/68562224464.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4373600c6---jirutodotojemipiw.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/55184077468.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/94749512695.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e85bd85d54---lisewat.pdfIn PDF document text
    • http://airmon.hu/images/files/vizawig.pdfIn PDF document text
    • http://merwepizza.com/upload/file/62600125451.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e986a9e5bb---lofokitijazudito.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/32901463482.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/madorewuw.pdfIn PDF document text
    • https://wavemed.it/wp-content/plugins/super-forms/uploads/php/files/bd540b224a9a389a328ce8ef8ef7a025/39046091121.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/datojax.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/28083476278.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/bojoselewevapatajopagis.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/84557967966.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/93587819167.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/82604252948.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/42jn0d1fo0m0t6rqva5qbu5fmk/60920271423.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/898b96c22cf39129f848682cdc41a0e5/fipofa.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/12668133088.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160767e71e3939---47115389940.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/suvubimemez.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_off0000e4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FA 10348 bytes
SHA-256: f837241c29f35897ecd3d5eff41ad4296bc58ed75361121d69a582a14983076f
font_01_sfnt_off0000fc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC54 19044 bytes
SHA-256: 7e12730f140bd5e526ca9eba97d28abb31b49e441e5ac2d8eaf8a5e12ee5e712
font_02_sfnt_off00012e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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