Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14f1f88744c1005…

MALICIOUS

PDF

87.4 KB Created: 2021-09-02 03:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ccb436c731d6d6dbe4135599c930d39a SHA-1: df11468e707194bf701de1064c6f3245b85d1de2 SHA-256: a14f1f88744c10056588fd9d892d95f453e5a7481c23f4b829982861b4151460
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a lure or downloader. The presence of JavaScript indicates an attempt to execute code, likely to redirect the user to a malicious site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • 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.
  • 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://futuresbuilder.net/dayafter/uploadimages/newsimages/file/87492891395.pdf In PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161109084821a6---muxolibunod.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/81142156839.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161234ec9c53f8---70790355758.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/21021294645.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/88493072550.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/kawizibebiv.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/16575538950.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/h64fmsj134m9oebnjos984r2d0/fizedizudu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7da13a7774cbf9c6743a9938ba8776cb/37344258054.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/83974447251.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/vofekosuxa.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3c3088470cdffce7a2f5e3e85c931af/36262519452.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/mqpaogb5pcr5kt328f2oe76994/85738782193.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/22c5e277dac2fbbf428621ad37139bfd/tosizalevobavi.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/jewebijinonod.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/xazute.pdfIn PDF document text
    • https://derfo.info/resimler/files/2263023004.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/05cd9284fb278eacf7e2afb5032d4a18/48520265979.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724c92909ad---38316021520.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160acc46a87349---goliwetazepiminerinol.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/vizowodediroletidikib.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/cd260cac3a2d979665b70436d7679165/17902614267.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc83b5d6f0---mizorunisuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dosage+calculation+rn+critical+care+online+practice+assessment+3.0PDF 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_off0000ec1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1B 11180 bytes
SHA-256: d11a72feb972ac75d7f2425a0e7c45fef187f9c241c531bad05d94fd83acd065
font_01_sfnt_off0001063d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4F 18424 bytes
SHA-256: 3e7939ff97dbcf35be36d4951e46faa435c7d3e1a3dc43aad3118e427b66f061

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