Malicious PDF — malware analysis report

Static analysis result for SHA-256 9504f9be8bdc6fb6…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 07:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 47f032a616d192a5754ecbf745377648 SHA-1: b8b0e023cde2fa201e6bf20e3849a2a97477d4ab SHA-256: 9504f9be8bdc6fb698ed635a5a4e4069fb75299469aaec173469a06aea977a79
172 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, some pointing to compromised WordPress upload storage. The presence of a 'download button' heuristic suggests a lure to download a payload. The embedded JavaScript, though not fully detailed, is a common vector for exploitation in PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ferramentabelleggia.it/public/file/veguxe.pdf In PDF document text
    • http://gemculture.com/userfiles/file/wiwesupefesudejimaw.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/36461258291.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/kiwagojerodibifefogegul.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/90900312855.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/79993975083.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/68533663850.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d45156c7---povujirirasapomonoku.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/gh1r1hd1b4kji0hdafi0imipu4/lunupuron.pdfIn PDF document text
    • http://teifsepahan.com/files/file/25845262209.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/41858091660.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/9697647591.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d20d3a9562---34179141269.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/14178302559.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8594d851f49d30d285e61aa95d6a84c4/jotukoxivubuto.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sagerakerigewedofiwogof.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/xekefozoxotun.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/mopezebi.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/12051961330.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ceb2e01e03e3a0c01775848624fc3d49/lirofixutexamigivobej.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/66458344202.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/20310874790.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/xexetalekum.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/lefobofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=funtouch+os+download+apkPDF 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_off0000da81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 18988 bytes
SHA-256: 32996a10bf9cbe463002e9beb178db0b5196dfc6619d0091c42bb7f48bd226cd
font_02_sfnt_off0001237b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237B 10544 bytes
SHA-256: 9af32fe5cc2df11a96ce7640cec1ddad2b92938955a479e5bc33e289859c4aaa

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