Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb469373f71f55b…

MALICIOUS

PDF

86.0 KB Created: 2021-08-02 07:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13bf1d94f8f42031e20bc8cef2d892b9 SHA-1: 042d12e767b56c6112d9c4b43b7b6e4c581918b9 SHA-256: 4cb469373f71f55b9d65b95a8b9bd53138f875e17ff05e84ded8a8aac388611e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malware. The document body is unreadable, but the presence of numerous external links and the high ML score suggest it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/603e79b7e0390593076510efff04b575/vagaxudoduxexuvomezu.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/59243020f0f66fdb3ee763cc439d3bcc/36700474950.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160882ce90675d---95060328562.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c970f3eb2eb---43873552543.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/6a2a4cf7a565db7e6415b694627c3ea2/16697926695.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f169c5e30---jonobelusuwowaralotuwigez.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/kseongfg02cdabbvclps7v7l81/54975529436.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db266e1b800---sedibazodux.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/3ed0b4f3d3646f6626a538bc2b1bcfea/wiwizixodipozodovumo.pdf
    • http://agiusfuneraldirectors.com/files/file/modevotobeduxelabadut.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076eecf85f97---xejufofajetapix.pdf
    • http://tms-operation.com/upload/files/19695500508.pdf
    • http://przedszkolenisko.pl/userfiles/file/48814101951.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/easiagjg7vf0up3jr2m2tjouv6/wikoj.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ca8361693---30696580239.pdf
    • http://mcutech.net/upload/2021/07/file/16271722761841749766.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/mtg9vosn8n9egtmcdilssf7csn/58845308534.pdf
    • http://wwstationery.com/files/file/kesux.pdf
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/33180452089.pdf
    • http://rspon.pl/images/wyswig_images/file/pelomofewafozalos.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161029d49801f9---turaxibaminogowozawakedo.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/4809e861ecba43084511dba363b40586/21981719171.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=thomas+hobbes+de+homine+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_off0000ebe2.bin
fedbacc9b734c640de4b0a190f51d1021bae66045b4b9d8c102c075be7540b65
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 10620 bytes
font_01_sfnt_off000103b6.bin
295a7ff48d7f727cfa3ef48ffb0fed203f4bb3cc2caadc8fff92780321f9fe3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 17856 bytes
font_02_sfnt_off000130ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130EA 16792 bytes