Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f450824bbffa1e0…

MALICIOUS

PDF

103.1 KB Created: 2021-08-03 01:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d22ef0c15a273f72fc3781062fc3b0d7 SHA-1: ee788712b92685b8483b585152244610d24b1300 SHA-256: 9f450824bbffa1e09dd788c08a39f33d2eed364744bd77a1206a4bf1be87aed6
96 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 CMS uploads and disposable hosting. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/shk908nrr1sma369v83alqciou/paberumasorepageguvukor.pdf In PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b03aaea652---pozofukalu.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/56608361016.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/zadizas.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/biwowudafozowivesi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607022237f59c---90949325538.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5edbac97a---78145402521.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/gukajipaxamu.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbee7a12f83---18654015490.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b510ec26b97---texutepa.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607df717f3ada---37576794474.pdfIn PDF document text
    • https://istihdamhaberleri.com/upload/ckfinder/files/gokikagugexu.pdfIn PDF document text
    • https://mashura.co/userfiles/files/tisuzewizoduwota.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d39f85b6bd---75031835985.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/31f6a925f128262e70a6d489338d439c/43753254969.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07e72cd0fc---mepefomemexizov.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/vomaliximod.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/sudozugodowijigeni.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/38670694015.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/juzevajexolagomugoz.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7ghl58jbekqckaiglvrjg4hd05/76628365147.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/1uqike84ru62rdie02emof5jdr/xonanajesomowapil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=like+love+enjoy+hate+dislike+exercises+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_off00012d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4E 17256 bytes
SHA-256: d167393c05bd74556c8e260a79355fa29f075a5cd3e336612ff74ec99a3e0021
font_01_sfnt_off00015a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A8B 11180 bytes
SHA-256: 3670ca3097acbdb516a1ae9fdebc3f3f7ad05f857414f7caca5a256e6241f9d6
font_02_sfnt_off000174a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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