Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfdd51f5af04603…

MALICIOUS

PDF

85.5 KB Created: 2021-07-02 14:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e051e52ae13e098196d7c404f70a2061 SHA-1: 5e68ab75757ffc83349ee44b6072c9f03f5d8618 SHA-256: 3cfdd51f5af046039084196d04fa6ee76236b45e430525e9fdeabc416d9fb843
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs hosted on compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to host or link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/got46jnr3sg3d664uvggngumv3/79482903239.pdf In PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/15637331381.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/vuziroxe.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/hobob40bh36mjkh4bt9fhiltlb/kukegamafiwujezu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/234ae1999e94027b83f219ae6ad436d9/fiwojogapad.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/logififeposinakan.pdfIn PDF document text
    • https://birudongker.com/contents//files/fajuboxopod.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/vawazekopaloviger.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1d9153de9---71747075420.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d84127ea5b---rizubuzivoraw.pdfIn PDF document text
    • http://allycatering.com/userfiles/76294754708.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/25ktt8ud27cvk35jlvh35uusem/mefekegokusa.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/38dfd2d1f9d21869c790b1ccb56235c9/53546312720.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9266f298707eca3fbebb32f0bb1add61/50873442184.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/t5gkhro5egtam2n7lln9fdk3p5/lanijuwozowunawuvomepad.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/04rmo3f5dm1re74rg4i7qep1he/19661880440.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0f8332ad---82407432025.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/4d3bf95c5890d90f182fd8d99218b03c/95045171176.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/fubabogonoga.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/d17687afecf11bca810aa33c4a931932/xojomi.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/vutez.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/46161e05eb7e50cdb05867c4b4a7033e/39136048475.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160728131e7155---93968543240.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/94c44a66ce359da6eed331177f452f72/zebudezopeden.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+defrost+steak+fastPDF 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_off0000eca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B8 10272 bytes
SHA-256: fe8de597b1a63b1d16bd6d68387807a142cca31fe4fcca2be3e72c6144dc2a09
font_02_sfnt_off00011c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C08 17172 bytes
SHA-256: 4c82555ef7f2926a217270cd4d473dddf8690a5664309be6a6fd79a2bb10265e

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