Malicious PDF — malware analysis report

Static analysis result for SHA-256 e383dd9c047be105…

MALICIOUS

PDF

79.9 KB Created: 2021-06-20 13:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 64e34e23663e4bb8e7e4709dbecd2798 SHA-1: 55af69be5a6e3d2ba75ffbf4eb10413b1be305fa SHA-256: e383dd9c047be10552ff183f4808f30c7543bd3dcf1cefd4fd5dd66228278b9c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing campaigns.

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://inwebjor.ru/uplcv?utm_term=exponential+logistic+and+logarithmic+functions PDF link annotation
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/aabenoj97hr9d8e9ckjsen1c91/78791320108.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1bku9i0cev7macip4p05ufckj2/mozonexekumupoxe.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/1m87tu6qa3f4lq8p89uo79ebtr/52838514185.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/9fb3ff2fc22e0209dfaf75c1302ab854/xusuxemotuzosolipuza.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fab12c9cf4---gujanufewipuraxefoda.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/razutog.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/xeluxikukuxipujiwoxabodo.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e37534458---63448998519.pdfIn PDF document text
    • http://sun-eko.eu/files/file/93735676390.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/8cjjoe7el4o02cil4sq8fjk3ud/ginasabodanamelakalogak.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b61f6c8dd---10930947314.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ce4c93bbb---58856013407.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/xupuxomerawojupeju.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/66289432037.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ba3e839ee857c505a5f37307d6e304eb/80979147721.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
    • 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_off0000df79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF79 5596 bytes
SHA-256: 8ee060db24339fbd72103366d7a1247df80bb2dc1b38651b2b1218350687e343
font_01_sfnt_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 12172 bytes
SHA-256: 06b7859adf5d9292098e3c3a100ced3fd0f30003fb8dbfa723d272271776f5a7
font_02_sfnt_off00011c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1E 16344 bytes
SHA-256: bd706e12874c942ab99088ff0040eade8b805b493e9d0493b689923f1ffcf1d5