Malicious PDF — malware analysis report

Static analysis result for SHA-256 30a948810ac9d577…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 21:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f3568b9c8bd006cfa6d2175b7d8fa91 SHA-1: 1e3737d1ca1c5e227d1d9ac470251ec5df006552 SHA-256: 30a948810ac9d577a3921e91363be09c2a04e86923067d1fb7d3408b3a5687cb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 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.
  • 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://carrieres-pierre.com/userfiles/file/73395034301.pdf In PDF document text
    • https://eventaipei.com/upload/files/suguzesasemu.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/4398715269.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/maregiwojapamametu.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/42592447421.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d2b89cbb2---43856896479.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161344c21b4146---37944179364.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/7jftjdic738r36beuen0d74jg5/vekelejijikariw.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/54579755533.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/20219693981.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/xibezifinipure.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9ba78ee49---totaxoteregufetojisip.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/robesovipuwonuziz.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/44437370650.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/42099780817.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/21373897616.pdfIn PDF document text
    • http://esipro.be/userfiles/file/nodifep.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/32872594595.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/89036289674.pdfIn PDF document text
    • http://0048.pl/48files/file/lekigusefuwisufasup.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/11220554322.pdfIn PDF document text
    • https://borsalino.ro/imagini_ws/79316487773.pdfIn PDF document text
    • http://full814.com/upload/files/lowulalazedaboxaberu.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/potutupulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=best+pokemon+android+gamesPDF 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_off0000e625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 10836 bytes
SHA-256: 139f88be0165ede48199a2c5dbb9a57afb86098149f24ce2519d0ead3cf36f57
font_01_sfnt_off0000fef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 16928 bytes
SHA-256: 5e77d8505459eed518b7c8d1499d61540c76ed387147c0c687ad1443a3a6dcc2
font_02_sfnt_off00012ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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