Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ce28f4a65a0bce…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 10:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe014a640a7f3244825dbcc4536a0b6e SHA-1: d32a5c2a53f209a390d6e9c97b279f510e24f3ff SHA-256: 58ce28f4a65a0bcebfc558ceebf8101333be03fadb29a677304bfeda3e6f7883
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URLs point to a common tactic of using compromised sites to host malicious files or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=introduction+to+polymer+physics+pdf PDF link annotation
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5a05d2deb---62166957352.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/25529957253.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/odr14i4f7r3ek6ek6ddr5d56kq/71015643872.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/11cb69e88e29a8c949cf8a3dda974ef4/67892827410.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d1e8c1c4db7af8b028c6c72d58b40296/68236685791.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210721075054_i1xriu.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/80448473301.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///15200910747.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/jababerizuroz.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/097b0c0d234f5bb6c5afc2368dc4fb10/89327019460.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/duratafadeg.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/32707266746.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/69415205155.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/50401946764.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1629564310.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16102c37d198cd---62994340078.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611d898163414---pilinelel.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/157c4a7ac640c009cc746b5ee72b0801/sipimuwabo.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/14880336654.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/junuxiramavijikutizorumiw.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/xufufigipalobadajinoxaxol.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/puxuvivativ.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_off0000dbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE7 10888 bytes
SHA-256: 3f102b6dd8f65f7e7719d75d9026c47295ddf045e3a529d363b998d59da9aa73
font_01_sfnt_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 17956 bytes
SHA-256: 840ab8a9da0dc3cc3cb62d92a19d61b8270b9280961d72a15174a64e1f8a7a45

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