Malicious PDF — malware analysis report

Static analysis result for SHA-256 972474e861310560…

MALICIOUS

PDF

86.0 KB Created: 2021-09-21 08:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 83523ee66e5c2cc84284c51da06a05c6 SHA-1: db55eec71cbf94542f6a72eb535307ed782a45f1 SHA-256: 972474e861310560601def446c39176207f2d5a5e770565ecfd0a75d8fbd5a54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites or disposable domains, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://hsaltsj.com/uploads/files/59601193819.pdf In PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d931a588d---pimudopobewu.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/24947351887.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16319861398717f9c10ea8d1d3b0.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135c3af1e548---27977361970.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/kevotabepugifu.pdfIn PDF document text
    • http://talesma.com/E/file/50719318789.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/90337348449.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/82988239242.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86839601519.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/dujiloputadot.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/rasupivawori.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/gobebutomurevivamibax.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/simiwumevebipe.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210905005205_tmna5t.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/rufiribele.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fcac66c45---40820379804.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d1f57667c---senomerobimikiw.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161422413b73d1---11388420301.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/63631266848.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/44252824998.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/venirapexisugewapeg.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/verenapipowip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+set+up+notification+sounds+on+androidPDF 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_off0000e88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 18448 bytes
SHA-256: bf8363fe538150bd6368eb375e726768398164862d1b33811d88a8222b0eb08f
font_01_sfnt_off00011919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11919 10744 bytes
SHA-256: 03a43c30b9b100c7c1adbdb87e71c4ee9c846ea0f276c2daf2cac8638f572d9b
font_02_sfnt_off000131fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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