Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e05b988f7eebc99…

MALICIOUS

PDF

93.3 KB Created: 2021-09-05 10:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 29951e87a88ebed6b3472f8be2271bd0 SHA-1: c50be344ceff06d56d1924c8ea31afa9bd0234d7 SHA-256: 2e05b988f7eebc997e452c6ab42a28eb53243f5ef543a033a18d18f3a7d68b7d
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160815c7c36de5---nuxejozuser.pdf In PDF document text
    • https://landi-bg.com/images/file/demenodibumekoro.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/af5cce297ccde35d12d29535f12fb975/tesesodudagaviwabokul.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/dujukatafoxasome.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e8893dd53---83604314715.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/86993822572.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/051749129804.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b899487d33---naguv.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eddf19408ff---51141985634.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e842e0f4---54839620474.pdfIn PDF document text
    • https://anjingliar.com/contents//files/funebagej.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/50260702288.pdfIn PDF document text
    • https://tomas-music.com/contents//files/84727259588.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/bifojogigerikikuwuveta.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/73ad5cc3ffbc99a3faa64a79ec9637e4/72197284595.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a099ecc309b---bifojalejaf.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/23977451770.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/42874178282.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/nexedofisakoxanivawunug.pdfIn PDF document text
    • https://airshow-bg.com/file/47596686207.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/geb2g3257mp66qpv24g0fa64vk/95988579729.pdfIn PDF document text
    • http://esteel.my/userfiles/file/zubamililarakeliwob.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799f3c2575e---2742938907.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/14370757524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=critical+thinking+in+education+pdfPDF 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_off00010866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10866 10952 bytes
SHA-256: ec2740bccb8d4e9a1691e5b6bd24684777815c96ad240f60c1719af0d517eaeb
font_01_sfnt_off0001218e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A0 17988 bytes
SHA-256: af63bd24df137103a3427c866cacd96c79e8d20bb83f1cc52c635dede38ed7de

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