Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b52c531f0d1031…

MALICIOUS

PDF

98.0 KB Created: 2021-09-06 21:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fcf03c0c81984d6f695d77744531ff5d SHA-1: 113943d0c113cb641c10a47314de142037801956 SHA-256: 57b52c531f0d1031604fa937ca59026a73d870e67b1a7e92718573916733850d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing a link farm pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608349f85c75b---80725150279.pdf In PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/gabawarupajiwanoga.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/49180256015.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/zabodaxex.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/36633142516f67b71335350462ef5289/paxobuxemilolututi.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/bbfa9e33b3dfcc8aae6445b86f3150fa/kejokigepitapodese.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/725cck86vk8k3gp6kavva5a654/57046849310.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c47f4d72c---18254518143.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75d364ba3b---pasidikatabemeben.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/lelutenusitonoxezitun.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/10992420730.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/40274011611.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b3ae23bf73---jiranamudil.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/be3bd06d37a11e49dd09390d230fe77d/vilew.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/vefij.pdfIn PDF document text
    • http://muszempilla.com/files/file/fofexatutevipaz.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/bixogesosejujijabebu.pdfIn PDF document text
    • https://akemi.ro/hirek/file/gatetizimozujom.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b847cc52158---36705591494.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/88066880349.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/ruwitak.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608083792925d---funovomuwejiwijama.pdfIn PDF document text
    • http://odmooregolf.com/clients/e/e7/e7046aca88cfcc92de0be8f3f6b3de3d/File/mixutupigijujikevopugija.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/31481984471.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/13013627069.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/91504764072.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/29912551626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pdf+creator+android+libraryPDF 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_off00011d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D73 17280 bytes
SHA-256: 7f0dd8316db845d5f36094b1030be7e7a6590adf1625dc0c7ccf71ba390a6a40
font_01_sfnt_off000149b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B8 10556 bytes
SHA-256: e44fca9b51945c9173fd2a7f8dc9acbfdb00594c1f9e4573f0b2546d8e0d66ac
font_02_sfnt_off000161ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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