Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db72f45a2d0c505…

MALICIOUS

PDF

91.4 KB Created: 2021-06-27 20:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cf0e18a12f0e1b256f530abc4dc8c89d SHA-1: 0e5e99841d2d61ef2c18ce0d9520e2c8cfd62812 SHA-256: 8db72f45a2d0c50561df702e24db557ac252a0450ab71aece598a54ec18dd95e
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting domains. These links likely lead to further malicious content or phishing pages, aiming to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://stpatricksreunion.com/clients/84553/File/gukofitoditedefiteso.pdf In PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b4c6162f4---20984127200.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607184d7809ad---31536957432.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/79a0a1e3940a1277d072d27b1a0335dd/83026317349.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/5962182059.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/dadadebibijutuvefakedug.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b63c4da0276ca900bed32ce9ff57ca22/89166728384.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/jesevuxoluro.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/21568308611.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/1459c953a3632b02a9bfc51503bc0fa8/nivafisotazi.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/trs5sghrea45hb6k7b55vqt3nt/vitimiwadabujisuxime.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/zitopifajiperok.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/23050219770.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/70774132582.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609545630835c---59298543582.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/42282088867.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/ru9g2k6anj9lsd22qq6t2tgkp3/patazonefaxuresefap.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/zazij.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/71858404045.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/678d020cae918458a6d921cabda45353/7293464273.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zikixajepobezinim.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160984f944a097---reditolupalazewemewiteva.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609520d956be6---bugarotonuvutit.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2d1f9404f28cb611f4bd5e5aed48197d/mebedosuvazaraxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=devices+used+to+detect+radiationPDF 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_off000100f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 18084 bytes
SHA-256: caeecec189ee1fa30efefdac04520ca460bc595314000d124fcaaa3919fb63f6
font_01_sfnt_off0001302c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302C 10484 bytes
SHA-256: 90f05507e3a0a7b8d56f30926be31543ef2c33e4849e2327001bedb75929f305
font_02_sfnt_off00014834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1