Malicious PDF — malware analysis report

Static analysis result for SHA-256 be65683fd141391e…

MALICIOUS

PDF

89.9 KB Created: 2021-08-12 00:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1a7d0031e86f513ad26956449018a5d1 SHA-1: 307a99868ed14d97d9b9bc029c72c3e3f0b2243b SHA-256: be65683fd141391e50e911e51eca3e0c3435834c65a2d7cbf25dc372c0be26d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule further support this attack pattern.

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://allytemp.ru/uplcv?utm_term=all+but+one+of+the+following+are+characteristics+of+a+least+some+bacteria PDF link annotation
    • http://stepasidemedical.ie/images/uploads/file/xekimiwokonafisexovanufav.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/xakumesusajaja.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/46916527363.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/34928601348.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa8cb89476---bulagukigaliseriforipan.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607310a0d6463---18685119152.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/moxenabagixek.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160939f7eb1591---guboxademafifidarebojun.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/nacf99ffjtjg21fv7104c08lve/20770143798.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961ed5e4489---41920268077.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9415ae340019f5e4500d7c5cf4ee8ab5/59458215526.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ffbf90c6474---wavuxofebe.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718fd3615fa---zepimipazapi.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/talumejowilenitipuxujibe.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/fuxiv.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/funufowonetunav.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7fee3a511c62d8c390f506548d7cdfdb/16215695118.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/pupimigesusilirerezemug.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/gopumatu.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b889d2bccd---buzowepu.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/farinobapelotatajepamofip.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3e8c0bf7a97b241a62e20035788e5b09/vodesatetakimisot.pdfIn PDF document text
    • http://ridendo.cz/files/file/69142423635.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ccc2e66fee6f3f1544c09682bdef4a3b/fazamiromekaw.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_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 17208 bytes
SHA-256: 3c2a065f7bba7c4d23088aa64afcf238cd9b622040564c3e7cdeb5964d91305d
font_01_sfnt_off00012708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1F 11092 bytes
SHA-256: 38acc9f4d54fb32feb659ff1d909808fc5098eba6fe41fa03ba802fa80f3af99

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