Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab654db81a2ff154…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 00:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8bb0e6de222c3a83d851d8b882237cd7 SHA-1: c8e023b4fce6b7d86270d45adeebbff8dca46a08 SHA-256: ab654db81a2ff1542d186d04b4c507e85cd9fa2af0109c16bac7360adb8a2b82
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm, pointing to compromised websites and potentially disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/zazaniralatenaruzeta.pdf In PDF document text
    • http://tlw.ro/UserFiles/file/mojuminimekubo.pdfIn PDF document text
    • http://spbi.cz/res/file/lixozasoxas.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/87177336844.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/18151645378.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/75248602535.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/wonuvitafiwewojosi.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/bizaforexixizap.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161410f2fe4144---vilemumerivipovojodu.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/zenosawodezazowusak.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/12391831732.pdfIn PDF document text
    • http://mlight.cz/archiv/file/36446359352.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210902103304.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/pataniza.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/57193560650.pdfIn PDF document text
    • http://innotack.com/userfiles/files/2574321843.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/somaboxorasofixenopef.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/vijeretemegunezolij.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/abf8752acc34b2749531bea16a671e08/safab.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135311abf562---71793003145.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/duxubibuxebupan.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/voronuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+benefits+of+plasticPDF 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_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 10580 bytes
SHA-256: 0cb400a5443aa44b6e8ec04d9470f85619c950b12bbcb638a30296478c2f0f8a
font_01_sfnt_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 16544 bytes
SHA-256: 7f1cb17d1f60fc41e1db210142e03b1db0e9cbdbdc4ffc2404982701203b807d
font_02_sfnt_off00011ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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