Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e6bfefe529e032…

MALICIOUS

PDF

87.3 KB Created: 2021-09-02 18:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0a1a54c8e8635f0cac48697a7be1f3ed SHA-1: 45783c5567b3ed7fcb950255c1547270f0d8efcb SHA-256: 44e6bfefe529e032e63e500aea5f3786ec7ad2f6aed7bd2ecfaad5428f983329
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://chizclean.ru/files/fck/file/11853914969.pdf In PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f7f86f9571cd99e776ba7bd53b0c951b/71703036370.pdfIn PDF document text
    • http://sparkpro.lv/content/file/sepolodafakeligirofow.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db1fb7204a0---miposuxufivobara.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/8489000127.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/fisebavatadir.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f9d4eae6b---57303567796.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/992583b051a9db219b84b2601f688c7b/xaduwaxexopukilo.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/degosizo.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/7961b8617b2d6ff39438a4e7672479e1/31150769327.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607c935e90245---21363908458.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/06a7130ade3b5c6cc97c26120d23b129/golozaz.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/88229044618.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/pojibajabajuseke.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e088727ecb---34406877847.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/zuveluxegazofozep.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5daa9b28c6f6199cf471f39c4b3aaea2/wobuvegobowo.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/rewupuxutososofabasasef.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/38871755472.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/22e16669f9d16f4ea3fc1930891b9046/81739855598.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbda9238b2---zazikararusaxavolafovexav.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/46116869705.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/dizeganoxofikerikuzeloli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=desalination+technology+health+and+environmental+impacts+pdfPDF 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_off0000ecba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 18808 bytes
SHA-256: 4f32bc36b4dc9720e1a559d401c0a6e5977db41fb9debfa842cf80c7c96cce4a
font_01_sfnt_off00011d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13555 11248 bytes
SHA-256: 6d3e24c2fd71b5c83e38b95830bfd19259aa20204832e0b7e1e78ea564c158a0

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