Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab053aac2e15e332…

MALICIOUS

PDF

78.8 KB Created: 2021-09-07 22:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f59092598bb82782554ca202c038e686 SHA-1: 97a2b0eaafe0995a60c753a9d713e123de42f1f3 SHA-256: ab053aac2e15e332dd3759527459629da0c10b3b3d4af2bac8ef77197a1c5224
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a malicious PDF designed to redirect users to potentially harmful content.

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 https://galerie-louise.be/userfiles/files/39267663083.pdf In PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c92fcc00f96---69029089150.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bca56b4854a---21929011266.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/xufuvupemebegudupaxojoz.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/sq00qo52thldonp7gm0nme29a3/jaduponipufivur.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161203818c3ae6---97848295365.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/jiliwodukepuzananojigenos.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/1567s42cusub4e5bs6ee0l0oea/rojaripijazigoneluw.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c11d03f3e39---gemozijiziwitekijizevu.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/58956541128.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210608_429A162EFA31B11A.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/gemukugax.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/27157644596.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/75412531701.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/44787219386.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/lijetikeza.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/wixumazu.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/811289413d2d5f2b345d14c47a3ccf19/pogigatogopelenuk.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/28b0a5f0af6c66b892b59beaf8954f46/61556506376.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/7f9b8bcd7f3fc53d4bc23ffaeada2b92/gajiga.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607599eb70ca4---kilizinebiliruzapo.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/41298107129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=stakeholder+theory+freeman+pdfPDF link annotation
    • https://lapdonline.org/file/88068839313.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_off0000cf74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF74 10784 bytes
SHA-256: 161a357e4cec574c9be03ba3be2bde9862b346610c1b6f1ba8bee81555f284df
font_01_sfnt_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001003d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 18196 bytes
SHA-256: 427277774f69f6fcf5ee776d0b9ff0b38a3705ebf8a98a48cd0d66e32b70cc59

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