Malicious PDF — malware analysis report

Static analysis result for SHA-256 b304bfc8bb92699d…

MALICIOUS

PDF

71.5 KB Created: 2021-09-13 04:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 242e3996afb0affd7f1649d7f4bec086 SHA-1: c5349f9587f05350cd7edfaac7d3a6a10db2aed2 SHA-256: b304bfc8bb92699d369094ec0b75d92de626d6bec9c8146ba987ee96db20a1b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. ClamAV and ML classifiers strongly indicate maliciousness, likely related to phishing or malware delivery. The presence of external URI heuristics and link farm detection further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/aucbuc5g1o3aol073e74s9kpbj/vuwuvil.pdf In PDF document text
    • http://paneldeconso.com/userfiles/file/12681164707.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/54503949037.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/jetikufedufetekorobakefa.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/29854012606.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/murowu.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/67854429253.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/qobds2pj4bkfugr6qgs2uuom4m/36658713423.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/busigemuzigurikope.pdfIn PDF document text
    • https://123natura.com/stockages/files/81000386051.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/lijunu.pdfIn PDF document text
    • http://talesma.com/E/file/xozunupebatufuta.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/jumevatim.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/40dbcc7c3a5fd6a5f12191705db8e185/79706465267.pdfIn PDF document text
    • http://heureka-cz.eu/files/jivezipajolujudividunaki.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///4591342668.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/fejisom.pdfIn PDF document text
    • https://rajaunited.com/contents/files/34238885513.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/29980197363.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/34933491823.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/bodal.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/25663701770.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/26664996861.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/dukogisin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=carx+drift+racing+2+pcPDF 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_off0000b913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD125 15596 bytes
SHA-256: a750ac56c986ae5ca386cf9e69f8778c2ac9003b2dc99a318730315c4b1145af
font_02_sfnt_off0000f8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E9 10580 bytes
SHA-256: 12faf7bee2d5df1db9e5089a5e701cb941214c352a0a8dd6473204548e565c79