Malicious PDF — malware analysis report

Static analysis result for SHA-256 4731fd16019ce584…

MALICIOUS

PDF

69.9 KB Created: 2021-09-04 20:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 439a4d757384d3248e33db8cfbe5c37d SHA-1: 37b740cff85dac29534ca83471fcca2e753f9d60 SHA-256: 4731fd16019ce5845b540777e2a7bf47311346d3a48a53ac436a078b4d04bf92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for these links. No scripts were extracted, but the structure and URL patterns strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aba871a9d8d---mimabu.pdf In PDF document text
    • http://archerelectricsupply.com/userfiles/file/61337630479.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/74217110237.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/71131707992.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/17633259334.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732f6343b0c---kizutekowexakakumapedawi.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/dadizobude.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/sadonulekaxedidaribekate.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/21206265552.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/pasumuvipubamerozavijul.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/vedivaditet.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16077bdcd52aa2---wiridipixafi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/dr7bf5sd1gq7ij7rbn5ahrc5h1/gonel.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/0s2dvm80gc3su7r8l2422r3fnv/refumedikikanetewase.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/6j1l10dr3u6mng0fgb6jkbae0b/rutefexeze.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a71c984df02---xojobipewusubefibe.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1485f1f15---53528091541.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/sosaperilujege.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/61885149993.pdfIn PDF document text
    • http://rogalafamilyreunion.org/clients/0/0d/0db8e8e54aa701f14f52e26b989c21c2/File/29554713836.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/vj3gl9r35p06k941kc76fa6q2d/wetuvafusilenu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161010e1021ae8---67230502647.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/026796a34bc438c3a807f7088042b934/9175560291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=avantree+headphones+user+manualPDF 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_off0000b4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDC 10712 bytes
SHA-256: fbabc6bea32fbb42b702fd526f906f0fb413825fe7097ccef72de2bbd338d3bf
font_02_sfnt_off0000e550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 14768 bytes
SHA-256: db8800e67e661e3919487752a01524c5905fdf29ebcb8bff84cb7b683666f8f9

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