Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b158b4bd377128…

MALICIOUS

PDF

92.1 KB Created: 2021-07-16 06:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af5f84409bf44bf580e0b1ab59606168 SHA-1: cda470c1bc0169e4788f649a8abba4619588b4fd SHA-256: 11b158b4bd37712857fdccfe183d1b002ca4b5e59a50c00249164817f75c954f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/32c359fe09dd70f36c54e6d773cae607/polonerugog.pdf
    • http://cuacongtrinh.vn/upload/files/97634317553.pdf
    • https://addsfly.com/userfiles/file/82775378721.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b25242453c---sizunivilasufipugeruvifub.pdf
    • http://elektrostroy.kz/ckfinder/userfiles/files/dilozazowegagigexo.pdf
    • https://bbpartner.cz/userfiles/file/vapudetetesefosolanenoj.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608061a68ea1f---vakiwifalaniledudoren.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/40a6c1f93d2fde4fd233215aa97b5135/3879883333.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d085b50ab---xemagutoratovofitaroxo.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a00307192d---51610775076.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/jear92rnqaj3auvqs29fgjm82t/rijumodafobolewebuk.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/n2u9g1icjlbptjlgsvlb12tr07/xetovewokivixuwasib.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bff50d4a2b0---zuwugimazizu.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d248490cd---sezujaloxe.pdf
    • http://archerelectricsupply.com/userfiles/file/ragalifovesob.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db9d0427963---zazimeperasurawodagiweduv.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c02d8a2c567---gujasixe.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa73c1a53e8---31899567635.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/zajawekivaravotepo.pdf
    • https://ceccarbotosani.ro/userfiles/file/20612095166.pdf
    • http://keletunderground.hu/images/uploaded_pics/file/mumevolakomawufunefizi.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f443d2fb0---58236670834.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/61bb55593f2208b99c180acb6fcd3a46/wumejinitirukepava.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=blog+website+templates+free+download+responsive
    • 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_off00010411.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10411 16792 bytes
font_01_sfnt_off00011c23.bin
d5203d583effd3bcb79a8096d3b5d0f286d53ec605aec563b2459b5c3a401bd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C23 17152 bytes
font_02_sfnt_off000148d8.bin
d60561424e3a2d408e0633cdd7d93b1fe837edfa819187d62d2cec54726725ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148D8 11188 bytes

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