Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7ee44321af84c3…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 21:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3ee1160a350bf008314e22af7fa2773c SHA-1: 35b952241cfed4bc40c1db4b91b67f634d912d91 SHA-256: bd7ee44321af84c3431bd09a11a914f8f485f19615aa46c4f97d1d049edf0db0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, offering no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://hotelpenza58.ru/ckfinder/userfiles/files/jogikitunawojuginujawuk.pdf In PDF document text
    • http://afghansolar.com/userfiles/file/31251656336.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/hn8jute7t7sgigvhg0tlbu12o4/27303606675.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210614081351.pdfIn PDF document text
    • https://birutelorasin.com/contents//files/10735087018.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610a7aaeb2e6f---kimadiso.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/57058331948.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad42d914e9---nalatidobosetinezuzege.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16086e2499bd6a---42483780808.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/faxubidixozede.pdfIn PDF document text
    • http://zl369.net/userfiles/file/42233748711.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/29220301609.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/70965969068.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/f71b1d24d482cfc2df882c80b6a259e3/28579463596.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131678a1cd02---tokexoduwirefel.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb2e825005---92189906960.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/35077113989.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/lubame.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/gubojabenazoguselapodixez.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/fitebe.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a268ce6ee53---wopagug.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2839e883f---femikojokivupulox.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/lovudojasadidafexowipuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=extended+metaphor+worksheetPDF 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_off0000cfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBA 17788 bytes
SHA-256: a1b06900e7bc78ee3ac7947c89d835bc0ed92eea615a447fe93ca44661231960
font_01_sfnt_off0000fd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11571 10780 bytes
SHA-256: 6dbda1ae15147414ef06570a39c820d11109f4f5ac92c6152bee15c5f7b2488b

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