Malicious PDF — malware analysis report

Static analysis result for SHA-256 2883dd34ee154f28…

MALICIOUS

PDF

74.8 KB Created: 2021-09-01 07:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad2a258c0c828905a9ac668847df6dd8 SHA-1: 2f0a8d536bd4ea52836ff38517f221bd68c62460 SHA-256: 2883dd34ee154f2849cd5032d17bc7639b0ab3b4107e9a7b5879352fd06a652f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection further support the malicious nature of this PDF, likely used as a lure in a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://rubenoferro.com/userfiles/file/79610052568.pdf In PDF document text
    • http://myucmas.com/userfiles/file/16477551892.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/17226587585.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/26155356358.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ci6iqn96e6cmsnrn4l36v2e1p5/rewiruzijijimutunaxixetaf.pdfIn PDF document text
    • https://dm288.com/slicice/file/zetofesituxamex.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/95785575925.pdfIn PDF document text
    • http://polipack.ru/content/file/lelan.pdfIn PDF document text
    • https://loctra.net/userfiles/file/30965542998.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a44bb4fa8---buzove.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612353e5dcbf0---87626398953.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630456492_b87fcffb17.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160cfca249a553---zipobesipirajepuvigigurez.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/wipuvenimobuvolojiwagoxa.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/14038366647.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/4900948844.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/323577741467c63435abcf1a3b42e1bc/kevutonozozewunaravori.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/patadozojakesipesafafud.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/vigerivadumatosenoxireni.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/c851b15ca70dcdd93fff6eb3e3c8ed60/xupesomediberovepo.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/ritozodumefekobeg.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/94205398619.pdfIn PDF document text
    • http://sassyissy.com/survey/userfiles/files/palemopujotamebosukepuwo.pdfIn PDF document text
    • http://rc-modeller.se/images/file///70844712066.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202172131517761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+meaning+of+the+word+pretentiousPDF 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_off0000bff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 16892 bytes
SHA-256: 12609f39ff4ed71ee28c70bb6ab56ba08b33ed027d9913ce4b74f45afbe5866f
font_02_sfnt_off000103d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 11048 bytes
SHA-256: 4352b71a4c47590bb40e6dcab10165627b20924024deadacb040a6018e72ed14

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