Malicious PDF — malware analysis report

Static analysis result for SHA-256 f222dfed8b00a32d…

MALICIOUS

PDF

185.2 KB Created: 2021-05-10 11:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7b50741f9a3aa0b93f8ee2c34432acbd SHA-1: 3fede364696eb982eef1758263fa4af17ceb1379 SHA-256: f222dfed8b00a32de22b27ab342fec11ca00aa4dacbafeb76ae816d53c84af4a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to environmental pollution information, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://archism.ru/uplcv?utm_term=contaminacion+ambiental+causas+pdf PDF link annotation
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/787ea3e895b0f9ad2644dc9bbd3dae8c/67243898487.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/p5avcjga7ionn0kodaik23kn1e/wutalibuxinizarajex.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5f4fc8a5766557e8b4e3b4ccc9fab36c/palatonuvofejetatoda.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/bcs6tia73rb62ha16qn85ce2ff/zofabik.pdfIn PDF document text
    • http://falerisztika.hu/tmp/fevodewakaboruzuzevig.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/xiveloruxokevukadekuzat.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/sufisatotalomilupavimu.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/f5f1af3f351b25c70d63ae9c7a075f7a/niwapifofewifa.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/3hnvbtq88fb66jni3b45iveukt/99462204452.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75218c3aa---wanifev.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc7db48df9---zamafiz.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/lepizewubolebut.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/36c3b2844590441eb6b98899456b57f8/92379406592.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/2f3e7c1984d10733feef2a32e916abaa/99213619065.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/01887bcde247586c4c068d8cdee7484a/78608667698.pdfIn 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_off00027b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27B8F 5252 bytes
SHA-256: ed84fbbfcac2dfce0205e6d7772be1a992e1ddad3bd047feaa064c396f3f01f4
font_01_sfnt_off00028d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28D53 16388 bytes
SHA-256: 6f2bdce0973842f5a02129bd984fe7a56e1e53e54df720ab4544871ee25dfbb1
font_02_sfnt_off0002bfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BFA6 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e