Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38bcdfb42ff5414…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 04:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cb9e146300031b289627517c5a7a2ab2 SHA-1: d7701dd392d80bafd92281e98318a456ee9ec21b SHA-256: b38bcdfb42ff541434144cd747641734576f256684b157bf90daf2831ad7490b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting further PDF files. This structure suggests the document functions as a link farm, designed to lead users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://embassyinvietnam.com/webroot/img/files/55820642904.pdf In PDF document text
    • http://bjjiffy.com/upload/pagadagose.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/7145e5a8e1a55aec4fde02556f9839b9/60362619792.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160721aa370cd3---kizulokekobivo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/0f8de5cc98b1803966bc92f1071d02ee/48143398177.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4f0de449d---80743537176.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/lomelolomowuxen.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/f0uvknq6gah7knlj7kvgthkjfh/35992211800.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/kowotozepav.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/93101828557.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/86239159287.pdfIn PDF document text
    • https://peterdegendt.be/file/4405270452.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/4286308310.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kimulamevediv.pdfIn PDF document text
    • http://www.agot.pl/upload/file/69063589960.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100d253841da---gegoloxonaf.pdfIn PDF document text
    • http://matras-devison.com/upload/file/wokif.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/nanurofemaj.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/84i4kq9bctkp1m7k15pijdemc7/dozabesapalar.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/wijotitefufofegazijud.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/40274785720.pdfIn PDF document text
    • https://digireg.pl/upload/48698804446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=omron+10+series+manual+pdfPDF 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_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 18576 bytes
SHA-256: 6d5b295dd34c955ceb13a20a31d222f5a0493643621d323e271f006c1d41048d
font_01_sfnt_off00010fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC7 10860 bytes
SHA-256: 059f456624fd7587bec0947be891be81a03465a148de8173e72a72e71bd75c6a
font_02_sfnt_off000128d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1