Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad5c8a2915920e6…

MALICIOUS

PDF

91.7 KB Created: 2021-06-12 14:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: fb1c00a5cb8bf0a0bc7170f9aa3d9191 SHA-1: 5aab956c04b67baad00975c56d07c1b3ed5bdb27 SHA-256: fad5c8a2915920e6efa572909fa037e73ee2735bcef14ec59cf22035f3aebaa2
156 Risk Score

Malware Insights

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

This PDF document is classified as malicious and contains numerous links to external websites, many hosted on compromised WordPress installations. The document body, though heavily obfuscated, suggests a lure related to 'Android emulator for chrome extension', indicating a phishing or malware distribution attempt. The presence of multiple external links and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nomylo.ru/uplcv?utm_term=android+emulator+for+chrome+extension PDF link annotation
    • http://huile-de-nigelle.info/userfiles/file/82147330715.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/norofa.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfcf819711---gudapusubujawerinezo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746d2b6dfaf---89095627078.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/aq13kq0ee43j315o2kg1ue3dt4/vaxizezolofowura.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fff2456afc---21878842293.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/fazumadugibiz.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609867f04c88a---52113136158.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/dudufagaxotepifivowaveker.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072701c3c0d7---6197614080.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/6205e8cc8a4d558bcaf2e75df6f2c65f/58578937568.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0df14d00a6248d5c082173ddd699d134/70474608625.pdfIn PDF document text
    • https://luminex.pl/upload/file/deropufagipudibidebovux.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/nukawizaxusunera.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9de39114---ruwesamilasusowoxixom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12908 5320 bytes
SHA-256: 27bcbcd44ba1c2e51bf5458ba01df4c4b781e173eeaf87333ccc327fac0bd6b8
font_01_sfnt_off00013af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF2 10868 bytes
SHA-256: 8de8b16c18245b14380d7a4cbd7ce28f5b70ffed24d7c20903b1edbeefdcd20f