Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab9bdfae63c8a25…

MALICIOUS

PDF

107.4 KB Created: 2021-09-02 04:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 745dbe31213f279d62193b1e9843a509 SHA-1: 21380e16c2d942f25fc1f0ddad55c5cfba242f7d SHA-256: 6ab9bdfae63c8a2595c58c915e4f1604d6f8924dd5aca5470928829b405d57d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://myucmas.com/userfiles/file/45470020739.pdf In PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/o9t0q998e21f8q9uk2qqtured9/wojufizoxirefagalajet.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/49350125326.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/detemavabukimutava.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ace19aa65bf---pazane.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d1373d3b76195899e74414809c1a8435/borumok.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/wumodudusevekimexib.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/26052193319.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2e47d14f7---pifogigijuzoviwono.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/64480719485.pdfIn PDF document text
    • http://iltorg.ru/upload/file/96567461380.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/15228433512.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a14ab6903dab5d0691967a16c37e3ead/13701453202.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/wofopapelugolorejata.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/xuxiromifig.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a30ebd8ce6---58757140500.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/momabafiwixonotog.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a67b7b943d---25586428801.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb26b650e---bedirinopipifakewegonim.pdfIn PDF document text
    • https://cargotavio.ru/files/file/68707754674.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/kijokuj.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb7f076f9d---wekuzefa.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/roxezozelupupusetepifefuv.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/fitexatipoxejabusewolew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=my+pet+dog+paragraph+in+englishPDF 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_off000140b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000158d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D0 10776 bytes
SHA-256: 016d380d51a168f247e828ac9a2d7e5aeb9c6e730a241df7034a6e9995edcc4b
font_02_sfnt_off00017151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17151 17244 bytes
SHA-256: 98bd5c3b1432b87072799e33e4cef08fe141507255e702fbbdf2889e34461dc3

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