Malicious PDF — malware analysis report

Static analysis result for SHA-256 3130c5ff49c37c65…

MALICIOUS

PDF

76.5 KB Created: 2021-06-28 03:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 821f91bf23d266fb0f389c6f9d6a61a7 SHA-1: 40808e1bbe7084be658d6383f7951cda662e2cd5 SHA-256: 3130c5ff49c37c655f728ab477fa7814cc1a9bf2060f622f55e94e56f19ecaf7
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 websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://begili.com/uploads/image/files/80148921711.pdf In PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/7196070269.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/kobunobe.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/kebapafometuwid.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/71308260575.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077503c3e1fe---35019839605.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/3b3db5de40199ab2e82ddf1cb8dc9cec/29111970844.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/81967561849.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/55539059414.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0ec73201d---raresazo.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607202b9f0b20---31987616654.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1ca5bb506e93cc965dea01bdaac103b7/tofuwagaliferat.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/92398744325.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adf3de6b18e---76011963547.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075f522a9b1b---tatojawamozutiwabivutenid.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160904f8e73afc---rupirejuwakifewatibi.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/a72018sq93mcek3uko09fg1qk3/16709772008.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/zavojudox.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/gpo9kiqcpv1vastl69f7s4hum6/simipolugifatuzibojan.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac36b35679---3889412062.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/kevoxamaruzut.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210513211459741960129.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30f5d31451---safix.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/54301f32b009e9b742a60801ed817822/72622517027.pdfIn PDF document text
    • https://landbar.com/upload/files/21089829721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=trading+in+the+zone+epubPDF 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_off0000c8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E8 16800 bytes
SHA-256: 470417ea60f926ac5ef3bcd31cc63a1d8cd66b6e525f50c8e23887eb94258940
font_02_sfnt_off00010ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE6 10720 bytes
SHA-256: 131738666c15c2c618bea9a95ffba4b986faef47d86f1b5a176d019f55c08163