Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5fd1d94767bc7b…

MALICIOUS

PDF

77.0 KB Created: 2021-09-04 12:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 849efb4ad490023cc56a6ca9c4aa0273 SHA-1: 203635f29df16382d971a1916e11f33dd4d276b0 SHA-256: de5fd1d94767bc7bf1083f43c1dd877731a891bb20ddaec4db833cc88c6c1ead
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure related to invoices or reimbursements. It contains numerous links pointing to compromised websites, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The presence of multiple links on disposable hosting and compromised CMS uploads indicates a pattern of using potentially untrustworthy infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • 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 https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/18b8300241c2f0d2f781b0dea6c817fb/99242082064.pdf In PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/1a3a0d66f16dbc803e6f990a467dcc62/suvatiruwalinave.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/faxibanixinak.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1624396142jasigoxof.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/1hg8s4luhrr2pdfejki4t6pt4d/dabidilese.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098555623859---boselajiti.pdfIn PDF document text
    • http://c-six.it/userfiles/files/6605150002.pdfIn PDF document text
    • https://x-software.cz/data/file/mojukikuxevepiwixowaso.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/pajiminivad.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f7c40ebab2d---guvaroxizijoterumuxomap.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/safonusapupufipodadoz.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c2eed4483b---virezinezuz.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/stoartr9r1c681762i61tvilj5/sajenenodilobali.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///jadegiwedisakogegibilag.pdfIn PDF document text
    • http://halaljones.com/uploads/files/8319493412.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210730191538.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/4809918233.pdfIn PDF document text
    • http://195exim.com/datas/files/xaxefupufituwegu.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/kifosemus.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/4372953869.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/23244766365.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/55642708106.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/81072489622.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/nopidunot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=reimbursement+expense+receipt+2017+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_off0000c89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89E 11184 bytes
SHA-256: d85d7fbb0609b77f78e59852f21ac1824e91fa03bf1ea2e8afc71ebd32795010
font_01_sfnt_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 16848 bytes
SHA-256: 52d85b9649a9e7a54f9609a8e0bed8179e91b114340a14cef09c329f7db86d9b

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