Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b777bdafb6e319…

MALICIOUS

PDF

88.2 KB Created: 2021-09-07 02:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eeac3ca676bf80720c18e36e24ea3d5c SHA-1: 143d0802bd7f4f4206fb9ebaa110f1c690af1165 SHA-256: 06b777bdafb6e31920532985e27922096aa753101ab37d6d9d2a9fe486306766
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=diploma+in+ifrs+acca+study+material+pdf+2017 PDF link annotation
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/9s8c02nptj1sufmo4lbm3as80r/38462797893.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d43b0f30a5e248d5f24f983063115095/34366314009.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607712f95b547---jafeneruk.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/regedoxulotudutofevij.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/vesolezopep.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/23883580376.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/dituzusir.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/72667096390.pdfIn PDF document text
    • http://belniig.by/public/file/78044616689.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/govisipufipulujiwujevi.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/02250b65b177e42c9d4620edde6cf147/jokim.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/50192039237.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/99069677411.pdfIn PDF document text
    • https://eetravel.net/file/mivavunivelerefanotoliker.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afda395d77---bulozabetitebidi.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/81916787826.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/84990269603.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210902221158.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/vutogadabozitoribu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba319959ab7---tipejulo.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/47907561674.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740bb9d05ae---85948633527.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f25df892d1a---66971857659.pdfIn PDF document text
    • 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_off0000ec2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 11340 bytes
SHA-256: 847643efc0ce40b52d6ee62b711de9718b0765b5c4e8550a76e9d04ee655dda1
font_02_sfnt_off00011f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F17 19048 bytes
SHA-256: 24c487e565d7ade73e42e92b5a3a05ed98dc1481eb4bb1b98f4c77c30f92ccc2

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