Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f18bf034a0ffbd…

MALICIOUS

PDF

78.8 KB Created: 2021-09-10 18:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a7ead1c4bc0a0423daaea7a67c6445d6 SHA-1: 8e26eb3d7ed7e7de14a49f73696110074e65c736 SHA-256: 45f18bf034a0ffbdc1466be9c3851eede7397ec9da2bec7bf194d563eb2ac661
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The embedded URLs and the PDF structure suggest an attempt to trick users into visiting potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=it+follows+full+movie+free+download+in+tamil PDF link annotation
    • http://strandedtattoo.net/file/35291484358.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/titujazudosivori.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/9903593402.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/76986134900.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/gowofo.pdfIn PDF document text
    • https://ptogel1.com/contents/files/99331619847.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613582e780260---74502783632.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/laroduminijakifaxukapekex.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/kixirovafemibemo.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161319c8588508---fizof.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/17269141779.pdfIn PDF document text
    • http://askort.pl/Upload/file/beronufifudifewaj.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/73360017157.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210905100241.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b9e2d190755b4fa0427b032a617c0ede/pitafutudufuduv.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161350d81c95fe---difefimulero.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/nemobogabisorekij.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131964c01362---40655346924.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b04ec21e8f---lowuxaxaderimegidajamato.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/lowesiruvujiwe.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/31358992880.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_off0000cf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 17880 bytes
SHA-256: 0915ea46967c88ca763bb60c4a5129299adbf676dcccf6c24aa727eae8ae4591
font_02_sfnt_off00011551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11551 10720 bytes
SHA-256: af7518a1c62a118179c40755ebdb5ab0a612e0d24e023392d6d47fcc6fd4b2e1