Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd2be6480b4d921…

MALICIOUS

PDF

81.9 KB Created: 2021-06-25 14:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87705d82702cfe0503f49d9a6b8751b0 SHA-1: caca555f7e7f0653020a6571104c49019be1516d SHA-256: 6cd2be6480b4d9212f42ca0873b35de21d72fd4033812039c57a520d6ae04c02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely related to SEO poisoning or directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pistant.ru/uplcv?utm_term=level+100+wordscapes
    • https://heritagecambodiatravel.com/userfiles/file/35312540967.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b8182ead4---34661710735.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1se5an4026vvtj322513acscm5/32841593687.pdf
    • http://porpora.eu/imagenes/imagenes_contenidos///zefadaxujisutawobivametax.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/86d08e3ac5f75bba91d673f14195c377/24485660186.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16093bce5467d2---bavilur.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e776d62870---fusivikevilabi.pdf
    • http://romengo.com/ckfinder/userfiles/files/27679140911.pdf
    • https://agentcctv.com/userfiles/file/bewobigowex.pdf
    • http://www.awakohchang.com/image/upload/File/6102139832.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d4cb89172---gijasipuvo.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087d2e9a4a17---80844768001.pdf
    • https://vokalensemble-vocembalo.ch/userfiles/file/80670857721.pdf
    • http://chanakol.com/ckfinder/userfiles/files/99099023065.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ada91a44eff---forupobasoxisivikuru.pdf
    • http://aj-logistics.com/stock/userfiles/file/79958998082.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f8e3575382290fd172a768a90f9f524f/gurozudubisidaxuvada.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de9d.bin
7ab265cd56f8e23b9d361ab73fc490793f881adc6267a801634a3087fbd71feb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9D 17064 bytes
font_01_sfnt_off00010ac4.bin
e1f00402628918440405ce28b97b4d61e8ab6d2f3166c9e8ff7ef1279072ba70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 10496 bytes
font_02_sfnt_off000122dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122DC 16792 bytes

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