Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce22187c20107e7d…

MALICIOUS

PDF

84.5 KB Created: 2021-08-20 12:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2e488d563f0c839e0639ed2c7128035 SHA-1: 368115585e8574759ec0137d6c8678f187963db5 SHA-256: ce22187c20107e7d4510d05c9aafc13e8189d45c592902cb04268272de3a8caf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to lure users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://hosrem.org.vn/ckfinder/userfiles/files/dopoviporuzalufe.pdf In PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3da3963aa3---46389015323.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/s6n8d43qnurhr3372o4r24e5f8/94031161223.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fd647a4a9---32567344506.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611c43f0100ad---79300386092.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160905b65335eb---61564700024.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/f81503a55014525c5503e06e8dba417c/jewexukunomuj.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/36090242851.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/cc1f993f0f541d206553ed5252320740/fotatixudawarik.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/18973622657.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/dipepubukexuwunarekixibu.pdfIn PDF document text
    • http://vo23.ru/upload/file/75861903942.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/13279137389.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b2c41e9e5---malutekexulede.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/pokikonerap.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/c393mjub4dchudqhuj5o9peqn0/46388675920.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c4d05e8ba23---nesogevotudize.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210628_040504_6626.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/gobumefutonekutaziweboxig.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/fosez.pdfIn PDF document text
    • https://isosklo.cz./uploads/74831823606.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/xezemerix.pdfIn PDF document text
    • http://skupka54.ru/upload/m/8972329148.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/jadatag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pokemon+light+platinum+rom+download+desmumePDF 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_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 16352 bytes
SHA-256: 34b959bfce9cdc5ffdc882244036285dc235b1f20b65494ecd66cf91ec5a766b
font_01_sfnt_off00011070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12887 11120 bytes
SHA-256: 055a4b545231b22b6fb393fa19c875461d49961630c1f04bc434d24e56c79469

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