Malicious PDF — malware analysis report

Static analysis result for SHA-256 cada4cfa33588cfe…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 16:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f0492f6ed178d397c094d8920de9aa9 SHA-1: 5df7383d27f384305c0a91b7d6e0ff3a5ea4a49b SHA-256: cada4cfa33588cfe0115f51cd43c76e9cb6c0cecaeeed1a6bb5e4fc8af05174c
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The presence of heuristics like 'Fake invoice / payment lure' and 'Visual download / call-to-action button lure' indicates the document's content is designed to trick users into clicking these malicious links, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://getracemirates.com/userfiles/files/remuv.pdf In PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/96762489898.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/40992590926.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/jebujibexemo.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/xibesubelabelewogoso.pdfIn PDF document text
    • http://epsilonsigorta.com/files/wimufamuvizumakige.pdfIn PDF document text
    • http://waberry1969.com/clients/877040/File/96654291776.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc73bbf8a3---32308117579.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/57933e0b29dc22b82dba8367af28ad73/89741540151.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ff7d9f29---26511356874.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1de2a0bc5---96269320478.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/kejiwog.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c32c713b473---50490188027.pdfIn PDF document text
    • https://xigmatek.com/upload/files/dozejebakowopawozes.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/22972281534.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/fexafuvape.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/62896420369.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/92606600414.pdfIn PDF document text
    • http://susanirvine.com/clients/82887/File/foruzawizexez.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/89428360585.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/g4cqgnos22n3i11ie4vna5mhj1/23389122758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=madras+university+time+table+2018+pdfPDF 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_off0000dc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC39 11452 bytes
SHA-256: fb212b9535ffaef15937a33d3b9405655b503d91b10924295f058d87f161c8a2
font_01_sfnt_off0000f728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 18776 bytes
SHA-256: 3db8e0b6ee5cc385736ad54d347955adee7e71d17fcfcdf5d5c1a3ccec3bb076
font_02_sfnt_off0001282b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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