Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb50577e658387c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 14:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67adc7a025be2c35bc8df42474797527 SHA-1: dbb9aa771c6a7f3920a6665aaffd7fbc21eae2a5 SHA-256: fbb50577e658387c261fc764b672874abcbd9aef6b6ea2e3cd50bb3d790968bc
172 Risk Score

Malware Insights

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

The sample is a malicious PDF, detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, indicating an attempt to exploit vulnerabilities or execute malicious code. The PDF also functions as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites, likely to facilitate the download of a second-stage payload. The presence of invoice-related language further supports its use as a lure for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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.
  • 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
  • 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://klm-co.ru/foto/ck/files/gunozemarasajufafeg.pdf In PDF document text
    • http://w-f-l.de/user_img/file/jitamajon.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132036986103---guvupopawotuvo.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/gasitixigenabix.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/3733896287.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/596508101.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1f42f21df2e4fe6b54736c6d8ae54376/39716694988.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/tipigu.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/43006524070.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/96355824607.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/64152805108.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/72171071528.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2e32803f---82143234329.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/58002383740.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135badf95c68---98754456750.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/jovebudekafega.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea6886db26---bugomumagafafinuvi.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/65683790974.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/dovivuzosekozuz.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/dilopegixa.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/65438265280.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/zusupetojedakujar.pdfIn PDF document text
    • http://thaide.org/userfiles/file/getevob.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/25651312636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cash+flow+template+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_off0000d7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FF 10584 bytes
SHA-256: af76564fc71f78fcdb979e24927a4c1e4996fe9a170cb2aed4d84cba8466f534
font_01_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 17404 bytes
SHA-256: fa66a6929118d8de1333aa0b2709d87cf73a3aeacfc198c2fda16053a2bcfe88
font_02_sfnt_off00011d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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