Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb8ce3a67bef475…

MALICIOUS

PDF

72.5 KB Created: 2021-09-30 10:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5d4a1ab2971432441537bd0b4d4d3b1 SHA-1: 0000712dafd2c9f52604268e8ab9f2b443155238 SHA-256: bbb8ce3a67bef475a180f20415744b73623e963daa554d77b99f7123b98ec559
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload storage, suggesting it's used to distribute further payloads or phish for credentials. The presence of external URIs and link farms strongly suggests an attempt to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613df0ee67676---pokaxesek.pdf In PDF document text
    • http://designerhouse.ru/upload/files/gijeraguto.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/majunodi.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/466b3203dbc6bae8edfd8128fb1fa3fe/65079199835.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/34090464561.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/wozisamoginagex.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/20251281061.pdfIn PDF document text
    • https://myoffice.strategygroupglobal.com/uploads/files/31715857915.pdfIn PDF document text
    • http://safarang.com/basefile/files/gapadadojawes.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/57616387941.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/lupozibofogotivosafava.pdfIn PDF document text
    • https://designclarf.it/file/68505203072.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/laxukanasamijudasalu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132381738a16---fazesujudivukolodisifi.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/dosewatonotejekemovudu.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/sixiluw.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/xatatop.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/26937137971.pdfIn PDF document text
    • https://fasleh.net/Files/files/giban.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/80352892509.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/dbc68bb5d03f043f910ac962490c21de/1807496629.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/37041878732.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/lixuvixuratosegezosod.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161506f9be1481---bilojusotigejakozel.pdfIn PDF document text
    • https://www.gitialiganjlko.org/ckfinder/userfiles/files/juvepesomeri.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/99559830733.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/sizirarumidakuzikatoson.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=free+magazine+download+for+upscPDF 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_off0000b77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77E 11088 bytes
SHA-256: bb3c5fabaa5341790d9e952972992991f4f2742ff7b742b0199848fe86181e2f
font_01_sfnt_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 16420 bytes
SHA-256: bcc6a289e07c37f7afee94ff1c10bf498cc3cf451e5f204d6e12e8cfe2cef5bc
font_02_sfnt_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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