Malicious PDF — malware analysis report

Static analysis result for SHA-256 2392aeb4b993e3bf…

MALICIOUS

PDF

92.7 KB Created: 2021-07-06 06:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 39c03723f567104e151f140f511fd1f6 SHA-1: 62293aa543c16902e3cfd3e5fc816c2cb528edba SHA-256: 2392aeb4b993e3bfeddf76b75b5ac98928c7c9d7bb72170ddeec2887c244caf9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites utilizing formcraft or super-forms plugins for file uploads. This indicates the PDF is likely a link farm designed to redirect users to malicious content, potentially for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • 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.
  • 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://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607559a969e93---47308760622.pdf In PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5bd162f23---77460414832.pdfIn PDF document text
    • https://2acontractor.it/images/file/6779192242.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11b9dcf6f5---92207237103.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/396adb0d70ea092766aed02813d22e94/wubapevawuxapijaza.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8a6b890cf---73869775066.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/90389438039.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccb70a529d90e807f2e765e9217362ad/fumolukejuwaluwalowime.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/84bbbb3805fdbadc58b174b58db2b49f/14862200884.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081c692764dd---niliwanogurexux.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062522483570554.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/dadogojibefevefil.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/91ac2e18a4bfc5260ffe42fa09e96ee1/60331845905.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/nuxoni.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ec62c5ba3---57231465199.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/wujoxemet.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/15270000270.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/bafaboxojen.pdfIn PDF document text
    • http://belst.by/upload/file/74585156715.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa16a6a136e---54096419220.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/57494871942.pdfIn PDF document text
    • http://carszana.com/image/upload/File/13696266713.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/wozunowemositegeb.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/lewamutoxikusalapufivotev.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac652aae100---50909389147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=max+fisch+guidePDF 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_off0000ef77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 10484 bytes
SHA-256: 2fdc9e4d42316c9770bc706b9c462802adc541fc323304df3050268ac26a704c
font_01_sfnt_off0001073b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073B 17660 bytes
SHA-256: 8d803ad0e9ff068053aef5f0dae8c76f8c7675945e9ccef715195d3f33814122
font_02_sfnt_off000135a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A0 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_03_sfnt_off00014b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1