Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef2ff6208940110…

MALICIOUS

PDF

69.3 KB Created: 2021-10-06 10:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7cd8cab0cd1594ad288b1a629f66aad6 SHA-1: 3dc99818c88fc8f866040da65a8a9cf0008d57fd SHA-256: aef2ff6208940110c4d9cb83a3da8a9ce702d116018a722aa7640a46b7b16cb0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicates maliciousness, and the presence of link farm heuristics suggests an attempt to redirect users to potentially harmful sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or redirection scheme.

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://ketchas.ru/uplcv?utm_term=christmas+meadows+campground PDF link annotation
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/h3adli12m28krr3ehj0uifal3q/31482305543.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161385612c98d3---luligikaxinojojededakuja.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/79188699491.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/zivuzerenevusax.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/xanosawevodafapelilusol.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/gogav.pdfIn PDF document text
    • https://contabilidadegoncalves.com/fotosempresa/files/4485807433.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/mofumabuxu.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20211005135121.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/58670248190.pdfIn PDF document text
    • http://hairandoil.com/uploads/piwibazufetidojov.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/33707079390.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/58559686744.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/52817985231.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/8900364243.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150e1a555de5---botizefilawuvisatatop.pdfIn PDF document text
    • http://praguetransfer.com/files/file/miwonipuforon.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/603b785036a27a32acf5b7fd16594f18/94374097021.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/59270073618.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/39105500228.pdfIn PDF document text
    • 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_off0000ae55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE55 15628 bytes
SHA-256: ffb0c31e41bce2b21d267421f0cb9d04bd885713126fa92da68f65333bc07914
font_01_sfnt_off0000d674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 11132 bytes
SHA-256: eb82833e77b767754188f14c7d7111e47d2b4d5dffa44390323ad10b5bedddaf