Malicious PDF — malware analysis report

Static analysis result for SHA-256 8358a4e532e2c512…

MALICIOUS

PDF

77.6 KB Created: 2021-09-16 07:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5515a0fcc006b8a3593a88f930a0c58c SHA-1: a50bbf89fabcde0c5be51ca9faed9e6643a6c67e SHA-256: 8358a4e532e2c512d793a65b6bb7801cc40ccced9efc7bab941afdcec3bd3f65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133209887d64---resivazafefojexusexomiw.pdf In PDF document text
    • https://netiko.fr/img/Data/file/durirusapopibimos.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/84454057098.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/jomel.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4859b30de---kujotoxisifasizowojor.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/jisez.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/26208991266.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137858845b51---4461542874.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/xafalibemi.pdfIn PDF document text
    • http://muszempilla.com/files/file/84922061012.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/tofez.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/99539623197.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/13538602834.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/94524270462.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375fb39143d---44370810419.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/ae8eac2bbcb00b5e3602c6ba25691259/51440126780.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0958086001631172757.pdfIn PDF document text
    • https://clove7.com/userfiles/file/16662812638.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/femudodafisulumokofikive.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/dafagoputas.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/d0fh8tjgmckfn3hvkkt5ft4jf0/zubazemo.pdfIn PDF document text
    • http://hanauhrova.cz/files/49777211017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=investment+valuation+by+aswath+damodaran+pdfPDF 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_off0000cc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC07 11220 bytes
SHA-256: 028b8b04c52fb2947e875562e4e0bc800447003ca4fec9a0f89fe455c96ff3ed
font_01_sfnt_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 16660 bytes
SHA-256: 6d2aa9d35616ef0a22a6e433eba72ca7fbbba0441ca627fc3db991631b48442c
font_02_sfnt_off00011081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1