Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d792ddda3d8e419…

MALICIOUS

PDF

87.4 KB Created: 2021-09-04 19:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d9d582a19149126b0db5befcaa80cf57 SHA-1: fe6d1b195049e8ba358e7663f18c2c16bac85509 SHA-256: 4d792ddda3d8e419c29d4aaf5eb8c52a0c226e81cd0f20ea85100b5792568ff2
116 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and one directly to an IP address, suggesting an attempt to redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the heuristics point to a link farm designed to host or distribute further payloads. No scripts were extracted, but the overall structure suggests a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://eirai.org/editor/ckfinder/userfiles/files/magoxa.pdf In PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ad5a2d0ec---84179851392.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/nanab.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/33819872907.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacdfd1626a---guzebefedup.pdfPDF link annotation
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160923212b2f56---2428037550.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c49ba45e81---67161768398.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/67124525222.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/11387538540.pdfIn PDF document text
    • https://tavio.ru/files/file/29089451694.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a83d198efbd082c813695c3d7b92b627/86806333133.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/favifegud.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a457919822e---sezagixadumabise.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a0120246ec3---zoxezedopenukekepeguz.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/imaxofawosexogig.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/15179ns4a529lk7hpj2njcqdq1/42396236418.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd6707ce04---zatanibun.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210725_C891441CC745A5E6.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/66753934803.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d614901796---zuguku.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/40023da4f5c14500e14d11d0dfd5c2c2/zuvenukipavavere.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607540872b90b---48607627677.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/84203263062.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/73782298907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pestisida+nabati+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_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 17804 bytes
SHA-256: f55ce8f19ff71b42b4e1fbd7fbab40465a9a992f2db4cc74496fe7b352f531e6
font_02_sfnt_off000138c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C2 10364 bytes
SHA-256: d20c1fa5ed8880838182ce1d806226c23efbb006dc414f3138ded76a0c1cbf31

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