Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53149626b5fa9c0…

MALICIOUS

PDF

89.2 KB Created: 2021-06-05 05:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d5a1e35d37106163e873f9525d3cd116 SHA-1: eb8829b6f1428057fad6b468f122ef04a8f5d391 SHA-256: d53149626b5fa9c084ce9b117b44f7e3a5098ad4a21d2955ef926d85eaaeeae9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to distribute malicious PDFs. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, potentially disguised as application forms.

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://huntic.ru/uplcv?utm_term=feu+application+form+for+college+2021 PDF link annotation
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608432cb6fc85---83381668913.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/v7vj1qsb4nu0hitselap9jmmq2/fugazeregabelapa.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609483e1eeebe---lipobepajojimozebeguto.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adaa9a1f676---xafiwuwojoxuvuwikilu.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/hrck2sd6enfsvt43vek2ocb98j/nilidi.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/deginosefi.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/latilugafikipexevuzujala.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/5bf61a8d2eb879139a3e47515873e707/tumaguxiparefeg.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084a7ebe1148---tudofisovu.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/93563698571.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb995f37b6---95393937706.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/5c7sbh6c6gic400vmdav8kcuj4/rotubakababepokubugage.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b79d58631---43117875063.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160acd3c036af7---fowepunakura.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/tiwisixodurozodel.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105291210333866.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/11c6fed425b92851e9c25684df3f93c1/lawusozowetuliwezop.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_off00012010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12010 5436 bytes
SHA-256: 30e523e65df4eeaf531656d02dd324520155fd8ff2bf31f29b344f0a001ed0eb
font_01_sfnt_off00013287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13287 10936 bytes
SHA-256: 5ccbd0c0bf1996d50bfc5a4fff9996307d0ee1a5e6d1a92ab648363d0484f8f9