Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc848a33fff925bb…

MALICIOUS

PDF

77.3 KB Created: 2021-09-05 22:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e1c60e396a3a943429d456a8113aad4 SHA-1: 0c1e3fb480e3625babc38e665a64cb34ca0bac01 SHA-256: dc848a33fff925bb952176dc6fd9bdf983b6fccd04a7964a1a098f09d7c1eeb2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm and a lure for fake invoices or payment requests. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially compromised sites or download further malicious content, aligning with phishing and initial access tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://eiffelflowersquesnel.com/userfiles/file/fawofije.pdf In PDF document text
    • https://alshaabcoop.com/userfiles/file/55736610004.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/eaa08a2630d021462a0d6a3b901ecada/55468282204.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/69787078398.pdfIn PDF document text
    • http://co-mit.com/uploads/files/duviwusoxudututid.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085caff4b74c---dafodidazirinok.pdfIn PDF document text
    • https://senhewood.com/d/files/nituvinax.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/movodudi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b802cae3c72---mufukawogefe.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff2d2186df---lirolijobafu.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/14611838110.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/77717927100.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/pubuxixukeritisi.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///86679000488.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/kodetibarud.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/mamogisikitovibi.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a959df0f35---totulu.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/deleta.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/fkmt137tnef2rl7u755m0t4a6k/zeloseda.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/98655361959.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/bulafekab.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/dedab400006daeea2eaafc518982008c/11654626522.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/fujaroxawedelutusitutura.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/kujizokupubu.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/zoxizuxewuwobodasuvune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sanitary+permit+philippines+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_off0000c87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08F 18208 bytes
SHA-256: faf5bc174e8b227c16326e73597c3e87d654aee34be631f7be105a74742caaca
font_02_sfnt_off00010f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 10832 bytes
SHA-256: caa0e1ccff8ed560ccd5c9d0cf0a0efcd9c7425a87314b66f89b358fd3a8db99

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