Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd364e69f1cdb925…

MALICIOUS

PDF

119.2 KB Created: 2021-06-28 18:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 623d460d4ec1583791239316621878a7 SHA-1: a7331f3bfb931fbd8a7c85b5ff97035c547e81f5 SHA-256: cd364e69f1cdb925367f428f2c602fc4887d21f3e3bcf0501ecf4075769864cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites and appear to be part of a link farm designed to distribute malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a fake invoice or payment scam, intended to trick the user into clicking the malicious links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9ffa3167f---nasixabuzejep.pdf In PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e655a89db---46201729417.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608808be46ee8---90959103303.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/mamejowodita.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/mavifububowepama.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cea137f50---denabajix.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/c4f68de97a4bb3f052f29a765bd2c7f7/xesilodinuboreremojodun.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/ganora.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/2293565a47a911bc2aa414be3bd8ff66/40609959016.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/nurigodasuxew.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab48654b5a6---52378336985.pdfIn PDF document text
    • https://bonacorsi.it/file/selefajokasamunogelojela.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ab1qj7kunsmaooide71gbtjuma/vapegipajapo.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/71e96b74773da77a2cdad721fc1592e7/60666824815.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/wotobemabepevizeze.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecba7b8b7---semejewibemixosidi.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/35df5159e9c37bfb51be21f8c0bf2bee/95504957865.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/33d01ff5c75e37dbd7038e46b3e2661d/22249069954.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/6cf49609223a282204ac176069813e3f/wuruvitabumirik.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b1be7aecc---tajexosekowiwixeku.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/35066156315.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/fa35453b99823cd9097b020fe932a2d9/53431279790.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/jradu2djh65leiuud267peb6go/sadeduzajefomared.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d34dd82397---39243045952.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fdd0d6d9a---97690429274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=it+seemed+to+me+synonymPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14902 11928 bytes
SHA-256: 5399f654a883f6c2417642feb1f74526a24f76de95991f45bee739035b9b439c
font_01_sfnt_off00016fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FA6 17516 bytes
SHA-256: 47a42b63d97209be5e36bbe7b8cdeef7a7cbc8c4b4f3db4d079eeb977b99f756
font_02_sfnt_off00019d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B57B 10072 bytes
SHA-256: c1140f2aa32dc4f6f0c6501e9a3d1aa0713c04b31bef88eeb9d1ad0b5cbcf6dd

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