Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d830f378270d8a5…

MALICIOUS

PDF

81.2 KB Created: 2021-08-31 16:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7d8c7f103761af607cbf79739f510170 SHA-1: 8fc63329f370ea252b5c3588cd7a3b728d1e82e2 SHA-256: 4d830f378270d8a5c548bf2eeee2c58dcda5d5b7da0910922964800cff3408ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the PDF_URI heuristic further support this attack pattern.

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://chcial.ru/uplcv?utm_term=chloride+oxidation+number PDF link annotation
    • https://eminenceconstruction.ca/viking1/uploads/files/lewotulutedinevunatufimi.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/zajaw.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/p6frk58uknaq127a6mdaj87t2e/lolal.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/xewipi.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/nigopikirabunek.pdfIn PDF document text
    • http://chouchoudauphongongtay.com/upload/ck/files/fipubuvewukerefimumo.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1629633805.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/bl3pvmigf8mtlq628n9o0oa0mo/gebanutazag.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/lewivo.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/tatexenik.pdfIn PDF document text
    • http://getdol.com/page_data/file/guwuva.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/30478941750.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/gezatidowumuzabod.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/maxafatuvikisululuje.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e028091333---15716077554.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608430cb1d898---90411298130.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/8634945638.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0128e21e84---46643581383.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/remarujidarugozolupafig.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612035e79c190---sasujusedafivaresane.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c771d24c151---62216436905.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/vetizemavor.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://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_off0000db4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 10716 bytes
SHA-256: 04f850d1f7f728d3187ee6ea463bcde9e688541ec9d7073c7b522f79890f5c29
font_01_sfnt_off0000f3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 16636 bytes
SHA-256: 1313efc1ae2db4288bf8aaa53b302ea89c63c7cf2200de5f070ca1f32344e01e
font_02_sfnt_off00011eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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