Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b9a5f3fc7d92e7…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 06:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 72ce98a3d299653c41ef67c127fdd386 SHA-1: 2449ffe738bc50e50737f4e14287bb22592d0e5f SHA-256: 23b9a5f3fc7d92e7b40940eac019ab114a779208de719cb73ae23ebe67028142
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which are hosted on potentially malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608722ccc2efc---67292402078.pdf In PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc17ade4122---pikotuvipanukarifojem.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/nivomef.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/ruxuvuxinuvo.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/42lt4qbace5stomom3c25i7pa7/58537343803.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/kudofafinulogijokajat.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/pibijisodidoz.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc40d03674---99518699062.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/fusawunukajifawufeka.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/lalirukifojiwo.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/98098178635.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/durudisedivapu.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1622930393.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc029b64e9---40057172528.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa452ce6c50---85435780873.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/34547521239.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/jolujukizizumoboje.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf080709d---muzapewutokijixeg.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/wufutatukiruremowefibo.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e82abe1362c3aa8983082c8a558ce8cc/fuxaratafedawagudowoz.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/71700257949.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160720a038426d---68577566096.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/48329950109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=adding+ing+and+ed+to+verbs+worksheetPDF 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_off0000cf11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 18520 bytes
SHA-256: 6c93b987f2ff490ff5999375aa56b973f32241a957405e65873d43890e35c1d9
font_02_sfnt_off00011713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11713 10848 bytes
SHA-256: f080a28c3e7505527c595979c11147f02ba89ab5ec8279af7d390608a2e8014b

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