Malicious PDF — malware analysis report

Static analysis result for SHA-256 5149ec71c6d306e5…

MALICIOUS

PDF

91.5 KB Created: 2021-07-30 12:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9df8ccb688e32b241b3ec362492ac69f SHA-1: 66746cf3537fc6a9ed05d4c6619f7c9163cbfc1b SHA-256: 5149ec71c6d306e515a8a35c2eec8420904d7ae85b3824f1c8fc27a91291d177
96 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. The ML classifier strongly indicates malicious intent, and the presence of multiple distinct hosts hosting PDF files suggests an attempt to distribute malicious content or phishing lures. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/c36f764647d4725719ad9e07415fe508/29588881047.pdf In PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/virunubivagesomu.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/38148521477.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/hg8k0cgng04ej460k0ifk2hph6/72093920119.pdfIn PDF document text
    • https://cakkue.com/contents//files/numazijiwiwid.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/25828378604.pdfIn PDF document text
    • http://goref.ru/files/file/luzezizufubixigipeta.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e36868377a1---14710310367.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/39778525978.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/70639883933.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/t1bgb160tkahnun0m9idbf2k6m/dozilabozuzimora.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/sikupanulowitenuw.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/37f8e9f6b446186f9545988967a94fd5/90068285926.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16070beca07a2d---duwezo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbea6fc3fe6---23546157303.pdfIn PDF document text
    • http://phsbulldogs1966.com/clients/8/87/87911cb64b10f66d93d15f7b6e22d365/File/gunujupuz.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/vezugelavu.pdfIn PDF document text
    • http://toonesk.com/upload/japizazumenoxazijozimi.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ed304faab0580b47cbc82fb59a788b7d/donatanilaxipulewetupe.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1fda1e838d984def69752c6d8a138efd/kikewikenexunujoxoteleres.pdfIn PDF document text
    • http://halmar.info/userfiles/file/rifizodujunato.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/6e0e594b3f7c2c93249561ea37474ce8/budapif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+write+spoken+word+poemsPDF 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_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 18228 bytes
SHA-256: e7cf08f3595a1fe5ffdfdad1d5eaf239308cbccc0e341cf1f6064491087d04d4
font_01_sfnt_off00013040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13040 10512 bytes
SHA-256: 9da79ae802e65a25e921473803689c12f6cedc82378f4cf3c84e442444cf3c57
font_02_sfnt_off00014830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1