Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3333907859e7ad…

MALICIOUS

PDF

77.2 KB Created: 2021-09-17 12:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 828c3d69944442470bf81c17e2bd30b7 SHA-1: ab6836dc3e3afa50b8fa945206dffb95e47c3419 SHA-256: 0c3333907859e7ad8e73621c06c8a956799bfd3440e4021fd47b630cdadc19af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in one URL indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://crysiq.ru/uplcv?utm_term=contacts+iphone+to+android PDF link annotation
    • http://longchimvac.net/app/webroot/uploads/files/lomekusatebonoxobimaji.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/49704150174.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/5035441443.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/15753099316.pdfIn PDF document text
    • https://felixtrail.com/imagini_ws/wijarajawumekavezu.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/jufinukozeliki.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/56605527805.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/7f17040a9896c390a629ae61dde2199d/novobudesotojoxazikig.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/wegenewedadobozumisip.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xobakajonatir.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/vawojifapizi.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/zereturufitugetiru.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/zatir.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/xuvuvosonofigatomolifipov.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/79423989092.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/wagaburiluber.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/9635001894.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5b7e2eb2f---kokulibagopoxuzusad.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/73677748009.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/49937738109.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/voriwemepafa.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140370a9a3d2---zodurezikeka.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/mefewekuxidujejonoz.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe4d8834a4---vadivatugimobuxeno.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/15265373070.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/308778d957bc6d2c0cff9f84ad28004d/49903675801.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_off0000ca18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22F 10596 bytes
SHA-256: f51c61b979cca02c290a73272cddc43d0621b00ee58e77ed02103bcc945d380b
font_02_sfnt_off0000fa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 17524 bytes
SHA-256: f0e0372c675fca492bc36a8d81daba8bc8fc4e69f91698461ea1b5d50916210a

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