Malicious PDF — malware analysis report

Static analysis result for SHA-256 106ec610e690f160…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 07:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 994ad0fa7f974050331517b11757d78c SHA-1: 28c4043abb54f6c9c9fe1468462d9d67937d7e6d SHA-256: 106ec610e690f1603f6fd267b27e454b6039cfb83c542da2ed35f7317ee78582
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://ikhmongol.mn/ckfinder/userfiles/files/lilikozixade.pdf In PDF document text
    • http://daisin1977.com/js/upload/files/wituza.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/givemadujukap.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/nutuvapixilagapifinofepo.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/91640773303.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/nf0sum3jl9nijfoe71liol4ioa/zeforike.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10eaa75038---rakusulefapoladabe.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/mipurozufedixituwumuv.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xemotibizuvimixolurupij.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/jonexilonomibaja.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50d3e832ea---jonuxipedisad.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/gogepatosugejizaxuzedez.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160953d052dc99---31339139565.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/67526792132.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accc999548f---52235701651.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e1d9424127---40845125193.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1f9547c591aa1f0c67f9d8a1fb623788/98791394925.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/rumazakubafi.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/tagidoteloborubuxozekoj.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc2f67015a---59967767716.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/62622874346.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faca8b24bcb---44865724831.pdfIn PDF document text
    • http://ruihuitax.com/files/file/1931337187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=minecraft+at+what+level+do+you+find+diamondsPDF 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_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 17584 bytes
SHA-256: 6acb15f0ec71dd0769738919d0cf9e11f237834d4035491650b0026340560306
font_02_sfnt_off000126bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BC 11100 bytes
SHA-256: 6db2f66944f11f429ac5f17f8d099ddbd05f0f2be6d136c6a92227f701bfac95

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