Malicious PDF — malware analysis report

Static analysis result for SHA-256 d027167ae634824c…

MALICIOUS

PDF

84.4 KB Created: 2021-06-29 17:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bc3daf489ddb28c3e2d8505690b5f83 SHA-1: 6dcecc4fd75b171f1a0ed9b26276370246d0a7bc SHA-256: d027167ae634824cb09a7c7d6ae6953509becbae9c14470f8806badb20890df7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress installations and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the embedded URLs are the primary indicators of compromise, likely leading to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847b68b7f93---25887188184.pdf
    • http://baloneacessorios.com/_upload/file///xabuziwemeloferisod.pdf
    • https://hijaulumut.com/contents//files/93597389138.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/7ga6ot51gg1ko1348cm9j8mj36/28871662946.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e9e5a6781---69989498061.pdf
    • http://funperm.ru/content/file/relasudopetaxemimow.pdf
    • https://bloomeng.com/uploads/jufederu.pdf
    • http://aimic.com/userfiles/file/faxowokolotonidukaxofone.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8699b028ae---44162950872.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098394a8b4c9---36202235844.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608081ea0ac40---jusevukifubimizigav.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089599d32c24---38860408619.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/1cd9dcc72f2d647baa5a4c52096803f0/82979112208.pdf
    • https://emprenderem.cl/files/biwis.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/ef40215481c657dc89c62dc8cbdf6c22/faxuzulumumiposi.pdf
    • https://mariellatriolo.it/public/file/bubefomabubixozukole.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/hd3hbehluk7u579g92mt8d8vp0/vusamabeberevit.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075401846353---jekokewakeletagurepezasa.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a2a03a9e5---xemanesul.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da6f66ce213---36249543483.pdf
    • https://horizontire.com/userfiles/file/15592983123.pdf
    • http://musikpark-live.de/userfiles/file/fopozijokugipesuposolezez.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c398ae721a8.pdf
    • https://aradovan.com/userfiles/file/zofatufovuxalonurizan.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=definition+of+transversal+lines+in+geometry
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df21.bin
99630b37e6509769ae554be478779135bf4d4ac68248d9632cf343a0d15b96e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF21 10736 bytes
font_01_sfnt_off0000f7d8.bin
73e8f750ec768adba327b5ee5a342a82be3255f9a767052a5cb3515c5b28f6ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 18952 bytes
font_02_sfnt_off00012a48.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A48 16792 bytes