Malicious PDF — malware analysis report

Static analysis result for SHA-256 469e9751a1170ef4…

MALICIOUS

PDF

108.0 KB Created: 2021-05-07 07:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2579919dbff162db3e75faa28802235d SHA-1: 4ec95e02f5f7745457dc6b3235d58e5a8e0dc78c SHA-256: 469e9751a1170ef452d79f7268463d48a5c7ca0aa2aa68af8f8308da42414cd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create fake documents for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pogservice.ru/userfiles/file/4365477293.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7db27a714.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe09da7147---45907030522.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/7jk5456eiejec7shr75l7c9sa7/wabugavuvifikijukexigujuf.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/lnk8k0r13jr8knev83h16t6m66/95810884415.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/56c7c2d027a2e03e9de72c3ca47ba8c0/97924788568.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609491cde5531---63989407023.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d0fee4315---bakerulorevixesunawagodav.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d498cdb651---54414034044.pdf
    • http://meble-tk.pl/userfiles/file/60641999264.pdf
    • https://avigailpekelman.com/sites/default/files/file/46571973586.pdf
    • https://annjulieskarpmo.com/userfiles/file/54861596846.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c19c076e6---kigujodasawivotaxiraxilix.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4594be34a---jemanonitepifobaxivi.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/8669b38f439bacc3f6686b117d2b2897/diwugibisowetelalop.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160828017bbded---mugozofepozu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=banque+cantonale+de+geneve+annual+report+2017
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000162c8.bin
e715f167365e9a142382d877fc8cb3c216c20fa2c6a906fee8d635b47b1a83b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x162C8 5704 bytes
font_01_sfnt_off00017655.bin
3db6bc0e14ae8ff8578053af759e798c5e6b6579380c754f4bdffedd6a454c27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17655 12928 bytes

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