Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd2de3bbd666566…

MALICIOUS

PDF

72.1 KB Created: 2021-10-07 00:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb0d5e68ef2de0b2ed08eb45548edfc2 SHA-1: 2deeb81c7db75486de468af42dc4c9292f65aa3a SHA-256: efd2de3bbd66656647bd867a9aebf4291f2149716e3d987c0e87d531281231f8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to distribute other malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fff710ca5---ronuwosavixezekowazaxova.pdf In PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/paminadejifi.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/dunekosezamevaselelabes.pdfIn PDF document text
    • http://webursitet.org/Files/file/xomawepunimopukejumex.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/42558120095.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/22005166329.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138ee883f3c1---dipujovutasumavijivew.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/92973055925.pdfIn PDF document text
    • https://stvorki.ru/files/file/bivare.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/3799012973.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-19/20210919115234471431.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/ronunasut.pdfIn PDF document text
    • https://5udua.com/contents/files/nopur.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/rogidufimituriva.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/vesititebulusederuzituma.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/8080607014.pdfIn PDF document text
    • https://novsport.com/content/File/gilosizukikapizobatisutu.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/pevurovuwuvow.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/3790585711.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161434baa8bf85---61481213436.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/9213658638.pdfIn PDF document text
    • http://live-net.it/file/lagisaxaluj.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/tojoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=owop+textbook+for+primary+6+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_off0000b6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A1 16364 bytes
SHA-256: 5c5feaddfa6cd97ce11781ee1debee8fccdedea0117d298ccccff3c30248d2cd
font_01_sfnt_off0000e0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BA 11068 bytes
SHA-256: 5ce8737f0f5531149b6e2dd0f00a27380495b237baedefff9cd69d0dfc4f1abb
font_02_sfnt_off0000fa79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1