Malicious PDF — malware analysis report

Static analysis result for SHA-256 35cc4beea17ac7fe…

MALICIOUS

PDF

104.5 KB Created: 2021-07-01 17:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5f8dfcafdf5dde0afb73751754521233 SHA-1: 0df37fd2ef079d1092c5574663645e359e02a405 SHA-256: 35cc4beea17ac7fee679c4e8839863f2c4e1d0ffd1f38f3139ef105690fa47a8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely contains instructions to download a password-protected archive, a common tactic to evade security scanning. Numerous URLs are present, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 https://chcial.ru/uplcv?utm_term=what+is+terraform+init PDF link annotation
    • http://botosani.ro/img/uploads/file/82949649050.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/ninipewiwolalo.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/26bb8f863e99504b72f80072b63a7271/27439142811.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac100a3b75---mutevimuwagosowiri.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/63682105345.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a02f537aeae---luxunixivijijofamuluxaki.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/56312071479.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb09a9f8dd---kanexemiv.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/didotagunutevivebixosisi.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e7397293e---befubebom.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/zobopepaje.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/fuxajukug.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c40733ece---putimimerujod.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88068f79e---82789173716.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160942dcb68141---49151980622.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/diobm44c9vbql953kgi289ri0o/muzetifaxadutedipexe.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/17161567423.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/61271533526.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/5kuuqs8d8akfndcl9ge8r2c3ae/ginaludegojogotu.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/32979350390.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f115cb70957f9b77163c3ab0853c6c11/68332996935.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e4753e015---44007636544.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/77029245024.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D67 18888 bytes
SHA-256: ea70f3c3c7c3d78a0d9c98189933d244167e1cd23e29c46d15a1933c94ff8122
font_01_sfnt_off00014eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EEF 16340 bytes
SHA-256: 88a5f3ad9079b2340172ecd64f1cd79ba1ad1753eb2b73e58de10c5a7be67d15
font_02_sfnt_off000164e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E7 10428 bytes
SHA-256: 90fddd5001a358a0b992bce28d0a01cab255252a3ed5080c09f666b193518df1
font_03_sfnt_off00017c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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