Malicious PDF — malware analysis report

Static analysis result for SHA-256 3429beabc7d465f2…

MALICIOUS

PDF

75.0 KB Created: 2021-09-13 23:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 888f4b292d61e74d5b57a1d28df2de59 SHA-1: 0516c0e2f00255214752b8c011c0c6d415183b58 SHA-256: 3429beabc7d465f27b3a4d8f4b95c8249d5182000bdb5af9226b7d7acdcb7452
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The presence of multiple PDF link farm heuristics further supports the conclusion that this document is intended to lead users to malicious or compromised external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://szpital-sulecin.pl/images/fckfiles/file/rujokibevututomopipi.pdf In PDF document text
    • https://htijsr.com/userfiles/file/sazolexineto.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/gobirafokupi.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/fagimasowelipovebiriboto.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/saxavedamame.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346b603b86c---dapefonazodokudax.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/33519210346.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/waxiwug.pdfIn PDF document text
    • https://clinicscrm.com/img/files/77784672592.pdfIn PDF document text
    • https://thehouseproduction.net/file/11066685304.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/69922915228.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/tetodupatajorazibep.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/44915079315.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/vokixid.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/dqh98q047h5iu4hmsu7fp46feo/41011691988.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/26012615720.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/15192445834.pdfIn PDF document text
    • http://eva.am/files/6120686002e8dc63.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161325ca739858---80621533958.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/kuwozad.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/novavokegozedafo.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/balepitedafukubamokipudak.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210906050152925.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109050206484363.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/18405626966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=snapchat+location+changer+apkPDF 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_off0000bfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC5 17716 bytes
SHA-256: 23e571816ee1d9106ea6be6555b5a6f2017038694f52af7e3a300f3ef8ad596b
font_01_sfnt_off0000ed7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10594 10652 bytes
SHA-256: 0de2050713b74095a04f4f49d69af17a32f50e1af4fcb8d55d47a7f0133caf24