Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ea0bbad73ebeb0…

MALICIOUS

PDF

88.4 KB Created: 2021-10-14 00:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0516b10691b82c2a3ea89c12a9a8e6f3 SHA-1: 14f18612aa71c614038e93039da81a6adce80ca6 SHA-256: f8ea0bbad73ebeb084a10d7c4ee3cebd0d69717d9323dbd7231068e4a6a773f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution vector. The document functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The primary attack pattern involves directing users to these external resources, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/f6c8537dceed2976cc56fde89a3ad339/2014101170.pdf In PDF document text
    • http://hulstcustoms.ru/uploads/files/piwojefal.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/gelakonugofapudorewobexi.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/47784eeb4373986f6f870c4b46d82f38/wapanexozuxuluteraxuk.pdfIn PDF document text
    • http://airzo.net/userData/board/file/fabadunaninawusane.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/xemeguwupez.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/f451166a7c00ce4befc4eea9b8555943/tidufagavagewilawaso.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/67667623258.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/60475373783.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/fijotisemalerowupe.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/nedilawuxosavujawori.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/66296465184.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/venisejeji.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/41308559279.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/95494047290.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/gifidepivulogasepememo.pdfIn PDF document text
    • https://alariel.be/userfiles/file/wetuxapovizof.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c37aa44d7b---dulax.pdfIn PDF document text
    • http://classtool.info/upload/files/59575571702.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb38885196---gefira.pdfIn PDF document text
    • https://fptica.ru/images/file/10604385308.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/tizisumasafujiguzokizeki.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/17794938273.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/5bhJmFgkeCE/uplcv?utm_term=vats+wedge+resectionPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/kaloxugatemekeba.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_off0000f3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 18748 bytes
SHA-256: 703a214655014f4800b1f845e4cfed7f3d65b09d50b545f87846e8338822066a
font_01_sfnt_off00012461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C78 10552 bytes
SHA-256: 682d0c03ffd4f061ceb3be317e7b4a048aad6fcb21f1c0bd26c2d97e6cfee01e

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