Malicious PDF — malware analysis report

Static analysis result for SHA-256 beea1daa2c2031a7…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 09:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 950c5c45f922d98ef437273a935e0d95 SHA-1: 4ffffc9efff77e3728ecaa59f8286c5aa0b0078c SHA-256: beea1daa2c2031a7c32a97eb398f0679dda0b9a76121af961172fe19a2115ffa
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external PDFs, many hosted on compromised or disposable domains. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly indicates a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or download of a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=strategic+retail+management+pdf PDF link annotation
    • http://fitviewer.info/files/file/sawiri.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/falowora.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/misuwisozazezejamag.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16113d2e18bc56---sasutepopat.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/7540912518.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/feehp7beir15dcfl7q8ee9veh6/xakox.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/72101470232.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/gijaxu.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/13783180798.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/ligufobamulubuvin.pdfIn PDF document text
    • http://thevale.us/userimages/68641570481.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090606034678478.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/00cffe781af47ab8cfc8907f337d531d/52559194623.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/5019fada5d481c7a8f850b077a96746f/80959455503.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611169336148d---12912567297.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098db15a9b5f---xekep.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1627398014_13060a7c0d.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/20121209810.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/furupusavowiv.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/62717441522.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/95900750899.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a228baa4b1f---nilaxerizapokogotakibizu.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/begariwisoli.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_off0000d90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 16080 bytes
SHA-256: b62d2a6703c586ec8317e327b1d15c5bcbdbeb4a5e14dbc8baaaa04733c2f7c5
font_02_sfnt_off00011a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7C 10752 bytes
SHA-256: ef8bda5a4003bae20318277fa8903f252fe4c6971f4edf28126cb1022dad1b9d

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