Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5e1f1664a302e8…

MALICIOUS

PDF

99.4 KB Created: 2021-06-28 01:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86f2cc064068a64955cea02e350e5f74 SHA-1: fa6186468a18d82698b535e64fee1a7b090f1f42 SHA-256: 8f5e1f1664a302e828ca6a4d35bbf4e314ae9677e6256ea08e427c9b5662a4ba
164 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 compromised WordPress sites, likely intended to trick users into downloading a malicious payload. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of numerous links on disposable or compromised hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/2357a2802278152a7b7f684100fd5b7f/27242837481.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757f2af1afd---wosipobo.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a577601e8---44958922510.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/muf6lp3d6l4v9al9b8q6rdtjee/99084009898.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c67398d3fa2---veduvenekekig.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/e3ddedcc30c5ed04f14134712d5ca3fd/42258756221.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608268f679565---wiruleranebedutizone.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afc3995cdfa---3874061345.pdf
    • https://kuni.ro/app/webroot/files/userfiles/files/32177151235.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/33c8134def5f5d983b4430b12f55c3d9/16647500221.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a784ffbed43---86916646491.pdf
    • http://allycatering.com/userfiles/29173724787.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ec02deb7ee9753276142394bbfe7d8bb/nuxojiki.pdf
    • https://reitinguok.lt/userfiles/file/5450936896.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/c976b2066e747b1ce27fa1746338e2bd/15383027470.pdf
    • http://ge-mak.com/files/gonifawafevunotezokobi.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608255bb37e9f---muguvubi.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd2fcbf4d---lelukime.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070eba610baf---50362394162.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/5147bc3580e0821a6d8662503cee75fd/xaxumim.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/527dbcf19ddfaf46cf28d2b9619e3663/54112710541.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/gemixutinezevatokoreviv.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b2aba0b9a---92542143128.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=church+donation+request+letter
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b70.bin
254fa5529925a16c0f0196d26eb4a65dd614ec8800f8cbf59e2c33be308439a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 10744 bytes
font_01_sfnt_off000123e2.bin
8568f1d3b6958a3f0d63aa804570f0e0c6e2bcfdd53c2e147dc402855b60def2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123E2 17312 bytes
font_02_sfnt_off000150ee.bin
d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150EE 16488 bytes
font_03_sfnt_off000167da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x167DA 16792 bytes

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