Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdbcf0723bd312e7…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 13:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3ef0cb71f7dd6c46f6e8cb07b9faf209 SHA-1: de437ac4d5470156c555599559d606b3991a009e SHA-256: cdbcf0723bd312e7e8aa8c0227ecd566e632831d37e5ea7380834cd6431c702e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many hosted on compromised websites, suggesting a link farm designed to redirect users. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass security scanners. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://files.ibiza-ferien.de/file/39361205192.pdf In PDF document text
    • http://www.como-grup.ro/fisiere/file/nesakanozusinuruji.pdfIn PDF document text
    • http://superazs.ru/images/news/file/banomidadanegasisim.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/tabefef.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/gobaremerubeguzazuwudewi.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/1sk86vq2glnkh3eqb6vc0g3nr3/41738201855.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f29165060d---kovijosuregunidel.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/rujevuwil.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/18011178126.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/21445160200.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8531034d0888da2bb9386306ad4f46f0/sananofuruborumodudow.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a231be7465---bolita.pdfIn PDF document text
    • http://393citizen.com/upload/files/61859695381.pdfIn PDF document text
    • https://latework.cz/soubory/vipokisulabida.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/wifuxafetobovazepa.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/xemonobafisawifu.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/50676924853.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/44755106416.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132c589bf4f5---depozeriwubumade.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/75396749573.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/gelaxoxajuxovemufepik.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3534419c---vodimolovasub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=zarchiver+apk+pcPDF 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_off0000df72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 17948 bytes
SHA-256: 0b9b2b51f779e6fcd07033bebfa7bf5ce8ff617ddd7c41f275ba362b42ef820e
font_02_sfnt_off0001256d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256D 10056 bytes
SHA-256: 40afa50103a86ed475c0db267f117c966475b02fdaa0ffa9547fbbfbb42fe4c7

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