Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc42d52c533d0c7…

MALICIOUS

PDF

80.5 KB Created: 2021-09-03 01:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9a3e95b98a18f6d0be4d33163fbc2a64 SHA-1: 12ed2b1d87cce52ced7e23b3757867eb85c2afb1 SHA-256: ecc42d52c533d0c742f1d338c8e40464023f4720c2aedbcfcf5a56c3f636a490
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 unknown PDFs hosted on compromised websites, indicating a link farm designed for malicious redirection. 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 document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/40v7q2hpa7btphitqf8qurusn0/15772259125.pdf In PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/11047831192.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/64869196401.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/fc86af33cf9bc0bd8b8173648f9794bf/27194373974.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/77752326444.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/863269663.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/waluda.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a38869d909---96147740494.pdfIn PDF document text
    • http://piecco.eu/upload/files/jufal.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/nusonuzexabik.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/larepelolijan.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/36001929783.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1c66ea383---vonagaxuwumifuwemotalizo.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/gobaxolaripixarisawamiteg.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/zagisatisin.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/kawaza.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc28bc4b390---17599763302.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/2abb5b22a6ecd5ab1e5b89a2b55caf7d/sekedabusu.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/gikepid.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/mukamiba.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/n1ifut8i5ui3134trk8ag0qvo1/biwexozoluva.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607930cb4a0f6---soket.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/3e5f7e2a5fd25993d899c5caa42b8b40/37986785252.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/dirid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=percentage+worksheets+ks2+freePDF 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_off0000d2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 18152 bytes
SHA-256: 0a2c268ca9ceda3874679b4640571c2615779edddcf36d5299a7262737599622
font_02_sfnt_off0001199a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199A 10776 bytes
SHA-256: 5c34384c6acedfaba9d318be8adcf141ae4655cdc4ae918525aed84eee579242