Malicious PDF — malware analysis report

Static analysis result for SHA-256 df764840cd4304c5…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 17:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 983163e3f12627964a39e0e39c788f31 SHA-1: 6fd3be39d0c5599681fd25a48b97bf51942944f8 SHA-256: df764840cd4304c5136aad0a7e955e44292042764b9800b22c5f2c8dc9a149ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

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 http://doubles301.jp/files/ckeditor/files/jederivavalote.pdf In PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/5oapdq1ehhum7hvt78fs2bfmfr/21367657385.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/satovofirifu.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/98545517438.pdfIn PDF document text
    • https://wsbtitan.com/images/file/zemezuxipumuvinun.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/61092f1dafd9cd9de804cf45f6da44c5/zifilekarodojakizofuxum.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/ruzaviviluxerabamiv.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/nasevarivos.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/96248275950.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9b67098f4ccd232b841e4dff64d13de3/5023424254.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/nasavigimavoju.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c925ddc7cf936aaeb829c95bb8eacd25/dugipatafup.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/228b26a291aa70b4307144332c7faf8b/50019864024.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160876211924c2---jobigukalajexakenudasa.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/29887321905.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/52466149262.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/c07482a824854ddffefb431c84cee884/53947621022.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/pekexuletu.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/12049844809.pdfIn PDF document text
    • http://unibox.lv/files/text/vinuwasab.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c111a3a07c6---biwajibek.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612d63f96c0c9---45075294763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sintomas+del+sindrome+guillain+barre+pdfPDF 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_off0000db49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB49 18848 bytes
SHA-256: c723d924ef10eae43796c948247280c207838e76696c4ae8c6b145ac32d13d92
font_01_sfnt_off00010c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C10 11156 bytes
SHA-256: bd561cc24643b2c2d69c9cc31055f930954105b74f716111112e3585f280879a
font_02_sfnt_off000125a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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