Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e7b828fbf80834…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 12:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1715213c7b7c88667a50af4df44b5f66 SHA-1: 3ced24b8f890f1583bba30b0ed5189331fa4c629 SHA-256: 53e7b828fbf8083437970bbeac69480377f2968193e830f688de3d5ecf7dd307
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristics suggest the document functions as a link farm, likely to redirect users to malicious sites or download further payloads. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pemaboutiquehotel.com/assets/userfiles/files/16887288643.pdf In PDF document text
    • http://chpcentre.com/files/file/babugetefasiridasili.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2d7de987c---xujugozeputitapunukukoto.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/vixugewasifabanadewoje.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/vapufetaweliwila.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/63280797713.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161323034bed53---zanoxixevojudezatinesini.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138accbeafb7---xukulofukeretamidubutug.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/sitemugidelubefa.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210905181708.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/mujojeluwukolatof.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/92772965293.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/vupolupepifosadomomusiwi.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/rorixakafanomikimak.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/gesotasab.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/44679667491.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/99595396889.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/zukatamuge.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/1006619266.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/44659122140.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/18561cb5253c1df9c70cfb3e74bb3c75/19470141448.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/jirupidosi.pdfIn PDF document text
    • https://fishboat.hr/files/65494033917.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/5241045917.pdfIn PDF document text
    • https://partetesal.ir/data/file/43416534660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=go+123+tamil+moviesPDF 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_off0000dd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD27 10512 bytes
SHA-256: 07776ec252eb94e8d073f79487d85f515626df105d5f606ed04abb43221f7e5f
font_01_sfnt_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 17912 bytes
SHA-256: 1c41dfcb132f1492bac8a22834887e9325c5b3ef6165a07a82174c49644ab3c4
font_02_sfnt_off00012400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1