Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4d910a60ea1253…

MALICIOUS

PDF

77.4 KB Created: 2021-09-09 02:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2bd1b269dc78f94eda2b6aed78499d4d SHA-1: a47471b50682837f666f00a15eea0ab5db6ba997 SHA-256: cb4d910a60ea12532ae7ba1ed5285914d011b88874ed38176720281adc986889
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links on potentially disposable or compromised hosting, aiming to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613755d902d69---lekalalasawaj.pdf In PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edec8b4f04---japiwulorinidip.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/nibezoduxexusulovemoveja.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16131d3612386d---ponutudirupaloz.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/bemipetonosurizuxam.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/60481151332.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/janen.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613905fe1d74c---giwewexezukubivukowuli.pdfIn PDF document text
    • https://serka.com/serka/upload/files/botizeman.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327da716322---53601452206.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/fazepidulojadofaxezil.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/595878423.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138eb03ae9ab---xatixuzepetefupobig.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/78079923020.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/bimefegezorur.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/4237392576.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/98942139977.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/lupubudiwov.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210904115924.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/c88729bd24a0a6c057d9e708e50fe138/91710350545.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/losunaxelax.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/bigera.pdfIn PDF document text
    • https://cooperspick.com/files/nexopevoloxofaxoj.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/21854006551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=my+hero+sea+mod+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_off0000c90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11D 17676 bytes
SHA-256: 18632b27571f5791f217a5a2b245917160c23766601e84d1960a26a39efd53ff
font_02_sfnt_off00010f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F41 10516 bytes
SHA-256: 3d276c82690d5543245d6512262ba8f5249a4c1d672fd2b050e1fa90af161fdf

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