Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad33ad9df3104a51…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 01:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5dcf437870d3624bd09bb6caffc62568 SHA-1: 1be871b5e4f32e9b265a99ef92e997f72a339932 SHA-256: ad33ad9df3104a51bde1d2a911d3ee56d8e57412e6ab714e2d93fdfe1bdfe9dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=free+textbooks+online+pdf PDF link annotation
    • https://alrashed-alsaleh.com/userfiles/files/fapirodub.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138372b48243---gobil.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131702902474---31484938364.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/bikifuv.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/45908414173.pdfIn PDF document text
    • http://novichiha.ru/pic/file/xujugamul.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/59485104260.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/mawevemitugawo.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/87051690930.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/kuvoxizifo.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/294ecb93eb341e64fe6ac4a127821e47/92633463697.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/barivasulonifunaxosoxinu.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/kinosilajazutowibef.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613542da5ee89---gudaradijenepulikubagati.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/venav.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebeede7dfc---45765044080.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/jiwegu.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/38539649442.pdfIn PDF document text
    • http://watch62.ru/files/files/53232837094.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/6748128649.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/wazovosexumugamaxatebedon.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/vewivodeligamiwelotizof.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/bapodisariliruwokiwoluda.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd0097ab2d---15442182709.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/27100364756.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_off0000d955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD955 17052 bytes
SHA-256: fdc401d8fdfc9c645f402978a6564b56d6f8f6cb11b17ad4c30d14334aa46e95
font_01_sfnt_off0001058d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 10640 bytes
SHA-256: a8f21dd8194116f7825506b0da1e906bddc158d2d38426d16dc0384fa1b64ae0
font_02_sfnt_off00011dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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