Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cda3c551c5ed81…

MALICIOUS

PDF

111.7 KB Created: 2021-07-01 14:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 65a7639d6d191980080e610e88b17a81 SHA-1: 119937eefa02abb652b9f50d0f9a031bff67c87f SHA-256: c9cda3c551c5ed8105672769d08bb03f60e1509e7dd041f3d95b7b39f2ae0459
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2f6fdd09bcec568c3de82a21e5e590b7/22685967888.pdf In PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/c3fc898855598aee89ab1ecfe66f2ded/67577672544.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/54767928113.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/pihjscfmh7ff8mdndvot9510jr/58760598054.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/5a1a3f303ffdad157801458290d19e8f/5401060940.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/64902786345.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/rudew.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cace9c12204---fomebo.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072acd457e53---13402778904.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160784881d732d---wadorominapij.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aae86caf618---lupofanesukuregu.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/72793771501.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcffaf23c54---19021342580.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/3938de8da73fced7137800d873ebddd4/tatepemagowogapigifan.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609a11e6a766f---jutomesumijasimovenatinu.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819f2d2ef3a---xefafem.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/67476862695.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/zusilalilobizuletexo.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9cfbcaedb---sunelopa.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9887d4615343c1ba7793e2958ea6e847/31472342383.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/56003406891.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/2bd866573addf29047ecc1a1db818872/rupase.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/maled.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=unintended+in+a+sentencePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000134c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C8 18184 bytes
SHA-256: 2e36dfc34972cbeefbed5a589b5a05cb4e0250b2560bb386465e8cad3111b094
font_01_sfnt_off000164d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164D2 10104 bytes
SHA-256: 98843db380232d3199da8dbe4c8bfdeb517b95b5947b23d6aa425b565346870b
font_02_sfnt_off00017b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B76 17928 bytes
SHA-256: 5b504067d3b30acc1521fbb2d10c488ac1307b3cd1f46c6f6dbffe1fee812e8b
font_03_sfnt_off00019791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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