Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd674dbd33832bfb…

MALICIOUS

PDF

77.4 KB Created: 2021-09-05 06:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 780144329ea218e348a657af11212712 SHA-1: fb127eec4fd0943d5213ee75c51ed56323e877e4 SHA-256: fd674dbd33832bfbca2ddc07d8d87bcc42c3106a68ba68e8371311c8eb976fc8
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=upsc+prelims+2018+question+paper+pdf+download+in+english PDF link annotation
    • http://sk-massimo.com/js/upload/files/56903468375.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/3538996988.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9e0da36b6---popenusokari.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724ebd512d1---10209992717.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/f0caqg7pjfd7ci9stdfbo24vo7/dapexamalokuwojizajot.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/62598767847.pdfIn PDF document text
    • http://ninfahartman.com/clients/d/d5/d5ac6782717b6a1c58177985440d8e57/File/mafilukagatexozejobor.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609107df19c83---niwifuro.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/87fc0a3f3f7072b17d0f4439edb8d95b/nesole.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/tomiv.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/31907df3b6ddc32ff89311d97b8cb63d/61275639154.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/lamuvawolufekoniru.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609f32af32abd---92071568065.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/wagunoribivalezozotip.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b4889daf5ab---zugiv.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/dopabifivekaw.pdfIn PDF document text
    • http://wheatland1971.com/clients/25033/File/31599360066.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/bokimezuje.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/wunijutuwebit.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/wugefikipa.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/nisiganipemebebunagux.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_off0000c736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 17028 bytes
SHA-256: 8c96fefe4fc610bd10e9cdf50629e9e8a2233fc003301fae9ea046932b7ebf29
font_02_sfnt_off00010b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B62 11908 bytes
SHA-256: 8963c59f98b653bff1460dbbbd9aca3a33adc5d584509d79879ea30dc94d9e97

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