Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d4da0a2ed95a02…

MALICIOUS

PDF

77.0 KB Created: 2021-09-18 03:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 662bc809d1c6558d34e8d50fc4ce2251 SHA-1: 2354d22c9ef140db03c09b71406b738e2ef479e3 SHA-256: 84d4da0a2ed95a025b0b460476d9eb223035b0ccae6927654e92e9ab2b3b3948
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The presence of multiple links to external PDF files hosted on various domains, some of which appear to be compromised upload directories, suggests a link farm designed to distribute further malicious content or lead users to phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://studiochiodo.eu/userfiles/files/603571886.pdf In PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/54877212392.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/nezid.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/beragavokipixerigitak.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/niwener.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b7e1014ae---jagusevatunesu.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/38908985754.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/fujedasexasamadipopasek.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/57382441421.pdfIn PDF document text
    • https://bataretak.com/img/files/file/jilaborarute.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/72325841970.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/dopemubipunodirazaf.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/finixasuz.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/13127831370.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/94282999011.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/68297457037.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/g5gl22rnhvsdm5hrgkdm76ahm4/fifapubetawam.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161324d15291c1---55186264914.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/gorew.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/konigokaxug.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/jozak.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3c1a7c945a44c9bc891ae6e3374e19f6/vewafijefupibobuforo.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/zinelamewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=bajirao+mastani+movie+downloadPDF 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_off0000c811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC811 10744 bytes
SHA-256: f2a977590a2ab672a211b4155713406406be38d2e66257d204cbd08bc96b9b1b
font_01_sfnt_off0000e0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DB 17632 bytes
SHA-256: 657d6c190bb4183da038b71d2c66c4de4a102e4142a8e67d42cf6fcce66fa184

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