Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a37465ac76c1ee…

MALICIOUS

PDF

78.0 KB Created: 2021-08-25 15:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0733639649f00972608956c9dd6b6080 SHA-1: 491eb09a767e1b564d71808a4aa53c6af27f7828 SHA-256: f1a37465ac76c1ee666b9ec8ad7d5001e7f37aad6c5dd8efca93a2d0fcd7c1ca
96 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the document is designed as a link farm on disposable hosting, suggesting a tactic to distribute malicious links or content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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://krisoc.ru/uplcv?utm_term=class+responsibility+collaboration+example PDF link annotation
    • https://vivaldiroberto.com/img/files/mediafiles/file/25569281521.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a28676cad2---42361729336.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50b67b273---genibirejadotevaxigibik.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/49374728990.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afa4763225---17086673506.pdfIn PDF document text
    • http://vhktn.at/images/content/files/74054240679.pdfIn PDF document text
    • http://abwrva.com/uploads/files/55015672736.pdfIn PDF document text
    • https://promise-land.com/upload/file/digemusobobikasi.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ed4522ee9a6---zuxularivejetuxokobe.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074838be08a6---tolafojozalujukivusok.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/18641446792.pdfIn PDF document text
    • https://emmaushuis.org/pages/70554621723.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/knkc524guakis6ovq3p6ouktbd/pixisokilerelesu.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/mekewixuborakufemoxuzuxen.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/fifedilafofezabebugixepi.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077940fd0426---80426558167.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca92dd0aa---82969224168.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/nugexudoriruke.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a286e71318---48812452812.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a1594c91---pudabokofonunad.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/fof8201np1gp0e2g79qj2d65sv/kaninagabedotirukupo.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3339d5c88---88829641240.pdfIn PDF document text
    • 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_off0000cd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8C 10924 bytes
SHA-256: 5d102d2d16b81281788d454cd2e9aedb95e03ed09458bbfa2e31b68adf932e5b
font_01_sfnt_off0000e6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 16836 bytes
SHA-256: 207ac23a572d256a59f23892e22307f90d6df78d3b8f2d3be6d2214bc15ebcf5
font_02_sfnt_off000112bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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