Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ba66d1e470f2b9…

MALICIOUS

PDF

75.3 KB Created: 2021-07-02 23:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6b39fc0f0b30298ddc0838d28ce0a299 SHA-1: f947340eafed3f11785a5eb853d875770e2f4fcd SHA-256: 16ba66d1e470f2b9be93ffc1252ab2e24892b87c2dd5ec4d5367ac6bec7a90a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms, suggesting an attempt to distribute malware or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/531254defbeb07733881fe119f35ffd4/rupaxewixafexam.pdf In PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c6366ba90---4572122185.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/89514092094.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/1665694452.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/20461981982.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d37723350e---30418985070.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5ed3ad5a6---39346281227.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a230709b90f---xiwawopometomo.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/litojakudewujepi.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/rejurivevivarul.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160875a6931505---xupawuzima.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077d366e2897---57772457555.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/74599625752.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/67975801188.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/34161634117.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210612232541.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/21818103600.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c74c6f46cda1c46f3ff5917db6539e80/41472504378.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/49faelpdb1qvkcijfc8j9p0ak7/60808390041.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/91027724509.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/b4a717a2f769d27c4a7d7ab19b215b0c/wedadogi.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099d8f46ef09---varebiroteto.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c00666602---45851869202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=geologic+time+worksheet+answersPDF 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_off0000c6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 10896 bytes
SHA-256: 627bb53a75de27383a861e878e86d01094ae006260a83c9865cfb0638df9731e
font_02_sfnt_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 15760 bytes
SHA-256: 5a7f123e57ec1d9d48e3d0f4f1ad3ad0e924895e8a0ed7a47f8f9cb74b797d52

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