Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebcef28083b8776…

MALICIOUS

PDF

74.3 KB Created: 2021-09-18 10:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9278629081f8afe3768410432fdc9532 SHA-1: f8dff33cf48f4de9aa3db73c6c0cfcaf157852a1 SHA-256: 3ebcef28083b87764607c8aa5e9fa21b4c8d0fde63b599990b79410a89fe54b8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external links, many of which point to compromised websites or disposable hosting, characteristic of a link farm. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection or exploitation, while the link farm serves as a lure to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/cb42a26c688cfa769098e8c38e3c971c/namilifogotimomimol.pdf In PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///31159015609.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/tudoje.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/41774963699.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/27412931382.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/jokataviz.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614117fbc044a---16271297443.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/2773202002.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134fae5a9270---66843753849.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/zeruxo.pdfIn PDF document text
    • http://darstin.com/userfiles/files/jutotixibusozupilog.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/gexevotirizuxajominuvaw.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/17742140146.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/junogizapexujelaluzewapuv.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/86604463958.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/topazevegazofobutubuli.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/tuxobexagobefotutudefu.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/nudasifukawub.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/91106327953.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/gazewazamizaditifoxuzi.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210903105621.pdfIn PDF document text
    • http://leguido.net/files/tuxexotetudoparagaxuteno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=example+of+polyphagous+pestPDF 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_off0000bce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE4 17452 bytes
SHA-256: 44273a1dc3c15184a858e0cab0d5a89ef18686a008bd75428c97d0beee5f0c30
font_01_sfnt_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 10808 bytes
SHA-256: 0c6f85e6a8f6e3143ee9272d0aafa896817eaa1c7118488769792e8721f61317
font_02_sfnt_off0001036f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1