Malicious PDF — malware analysis report

Static analysis result for SHA-256 9853dd4342e45349…

MALICIOUS

PDF

90.5 KB Created: 2021-09-13 22:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b5d9d6bc91a2dd331af4611bc963d52 SHA-1: 6cb82778acfe95f7b84c30a1eba46830bd74b489 SHA-256: 9853dd4342e45349bb7e860e142bdf501cd25e9311afb6f514ae282375da9736
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://queure.ru/uplcv?utm_term=unfortunately+telegram+has+stopped PDF link annotation
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/73499361088.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/zazozijitabutaworaxuxili.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/mozodivokuwatosematixomev.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/falatiruregusu.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/robarite.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/94808647704.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/kogidujapajuro.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/weken.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/59598228340.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/64966949013.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/38290797407.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315b123aa51---maneredunevu.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/xirarokeketexuse.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210908_215204.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/18335126894.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399b9b8c753---neluxopimafa.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/ramokawujejokoma.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/seguziwipenitezolaramulak.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/4759456172.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/41301759708.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/rewofibaletap.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/dozezilumebiko.pdfIn PDF document text
    • http://retrofotr.cz/files/file/4808685752.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1afd2cce702abeae102032fba7e6c279/jilogiseb.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B1 11072 bytes
SHA-256: 0efd17da450c206d6a7714976eab884f48498bbea9bbbace4824f6ed71320b31
font_02_sfnt_off00011124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11124 16596 bytes
SHA-256: ed31aa5d4f031d1dfd40182324c9b73ad996a7a97c569b908507e5b9bfa02ab1
font_03_sfnt_off00012852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12852 19060 bytes
SHA-256: 4606d38bcd5afe4c60864223bece8382ae8c63ae8e0473e0a5dc8de4a0157837

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