Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eca4822062d5259…

MALICIOUS

PDF

94.8 KB Created: 2021-09-03 05:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8877d511f9e1317dcb41b37626ecc30b SHA-1: 7b0f01f2a72a7f33ad4544878312f892bc3052a4 SHA-256: 6eca4822062d525921c2553e8cffa2b4d0dc8c313e80eeeb9254d2f523ee1a7a
112 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting it's designed to trick users into downloading a second-stage payload. The ML classifier strongly indicates malicious intent, and the presence of invoice-related language further supports a phishing or scamming attack pattern. The embedded JavaScript likely facilitates the download and execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/99328650176.pdf In PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/jofogodige.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/zowiwasej.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/74740396498.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e05e53691---modoje.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/76724776924.pdfIn PDF document text
    • https://ijpdua.com/contents//files/besenupezumivogi.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/xijuzuvobug.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9a3c28e1a7ebb93cd7fb12a27506a8c0/25361045787.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078def5991bb---witeza.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/wuvip.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/69718146034.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/batilobekolewufi.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/22613555729.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8f3421e03---56083665616.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ermcs00u5ubpe6c2d2791h9jec/rapidobolokironunalukobin.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/76499574605.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c60ab483deb34ad31d05f81d416d1f5e/23170823677.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2adf13c3e3---vidamijepenano.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8d7d77ce9---jezidazatebori.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abd0220489---82466317495.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/50507422282.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca15a7c3de---38980763279.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/lanenirejewabinojud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tally+short+key+in+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_off00010d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4E 18192 bytes
SHA-256: eb3dbeec3cc5762010433152dc19765b724bd8acee54611b6eee896281ae6aa3
font_01_sfnt_off00013c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15495 10764 bytes
SHA-256: 00e7be5de8d987e84b699df3fc1c74bd9febda0d43c065718a14a27303087e4d

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