Malicious PDF — malware analysis report

Static analysis result for SHA-256 a380430a054a376f…

MALICIOUS

PDF

72.1 KB Created: 2021-09-25 19:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65365ee67417cd498b353b5701192dbf SHA-1: 6cfe55c98f58a513bc5a3b1cd1eb3e6e4a404ac2 SHA-256: a380430a054a376f95706b0b1ba91e71b24f0e7a95bab0755680da7888da79c8
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to files hosted on compromised WordPress sites or other suspicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates this is a link farm, likely used for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/84a6e611df94da01f355abfd4b2a9323/ruzodulap.pdf In PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/54344374377.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/bugokoz.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/fagosusavogusifad.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/dabewu.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/nenugit.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1aa9aba87ee3b0571b5cfe4165323413/67561496076.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161493a52a738f---befikiso.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/zotorowumonezuniwajozeke.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/worabifudetefejonepe.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/3610254302.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/gofudagoxewemurobewuz.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/96449371978.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/75499988088.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/jurerowolibomuz.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/kezidakot.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/59334400403.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/26529604582.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/45188966393.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/bofes.pdfIn PDF document text
    • https://olterus.org/contents/files/nibutuzujulivusiwifanamer.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/nuwifemokebimesere.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/24230067746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hanuman+chalisa+reading+odiaPDF 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_off0000b415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB415 17432 bytes
SHA-256: d2d97170cc274f072b4bbca9e44f5ec04d9c5582e034bd8c9acea22c4828d893
font_01_sfnt_off0000e081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 10808 bytes
SHA-256: 9c9c651027af629e52450646b70cd0665a1ae459f7a3d9dfe8e8ef3d225ae177