Malicious PDF — malware analysis report

Static analysis result for SHA-256 288b50bde41f8659…

MALICIOUS

PDF

62.4 KB Created: 2021-06-18 13:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4256d8ddc3d02c33d7118d1bdd9b3aaf SHA-1: bb9895b43d713732edbdfaa1f48a20e58f96472b SHA-256: 288b50bde41f865952d33857c361955a433f26b170549046c1c7e371358a07ad
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 CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://irinaburmistrova.ru/files/27976123051.pdf In PDF document text
    • https://cleaner.pl/userfiles/file/84912885077.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/75788587188.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/nofosupuwub.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/0p1pkfthtno5ns623cbjsgvbnj/fenotazemug.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160802ba9902d1---xololeginam.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/23d555477f0d18e2e3c2b5f4e1544d54/wolerepurefufeliwe.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/78fb63adbe996e31364119a383bfcce4/newagovovagagukopeguje.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/191gmabgr7k81ihsskd5uen8p9/repikelepa.pdfIn PDF document text
    • https://elektrona.cz/files/file/39813735802.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/6fcd4e4c943f56674e9c771e5a0ab7a6/tosufawufajuna.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082604f380cd---72823062899.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/wapapujowojagamoken.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/55f5ae0012c8f3c77be766d41cb06187/jabalufepanerapowoxow.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430062432553542.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/btavun18003fj4nfoo0udlcmls/53242717487.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/hktje0pov67rdbmjbbl55dq5k9/49770503581.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=twilight+breaking+dawn+full+movie+123moviesPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A3 5976 bytes
SHA-256: 871c4038e4da2deda935560e2c597d75d1cadd3e032abc371933a9289b031a11
font_01_sfnt_off0000c8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EB 10628 bytes
SHA-256: ecb7b621a4211e7e6828ca64dac9a579cf7e1b65f59cb6bd28e69f8cccb11ac3