Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6b3eb2151e6243…

MALICIOUS

PDF

81.1 KB Created: 2021-08-10 16:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0fcca5cd6a006834f3bf90c792e0fa36 SHA-1: f700460c48aa56f2f21fc93bd09e106ae84b580d SHA-256: de6b3eb2151e6243e371963245a2a3a5a148d4d4499c6a43aabb6cb02104bea4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of external URIs and link farm heuristics suggests the document is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cructi.ru/uplcv?utm_term=equator+and+prime+meridian+worksheet+3rd+grade PDF link annotation
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bda20b4e8---7542841669.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a4f486ab6f18a6ce66d82f37789577aa/lajepudapup.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/78237920645.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/d5fbe2dd3904d1d5b7f7f70c4e1b1435/zigenino.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/33792128392.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/pubiworapux.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/kesakepelovevuvajodubetex.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/juvuwubisedizenezowesex.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a82fa7e25adfb78b753a200bde764aea/5144374480.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160888e0fb0dcd---dogutebekupu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f230e8c36baf66e9c13f4a0e85fd2387/43012044929.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/31679262680.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/sumotedixum.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/81578142002.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a300d8d9e---32611962101.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210602201636.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16081f685a580a---jagutamowosabipefag.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/69484584539.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/55422ec578afae905168a7e591f2e20f/tepimaliwerosuvotonoge.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160873b45b940f---tedipibeji.pdfIn PDF document text
    • https://avela.md/userfiles/file/bedadewuwetozawoxofevu.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/nubozetaxowupumezi.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/jagolejumejolomamigisa.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_off0000d76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76F 17040 bytes
SHA-256: c49e44b9edf95bbc2d36cec5948f179474b32fd7493f7a20405418aef7d5a32c
font_01_sfnt_off000103aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 11372 bytes
SHA-256: 17ce88f11eab7a866043c5f506d04b98c7f41727194560d1906f15f689e4bb6b
font_02_sfnt_off00011dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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