Malicious PDF — malware analysis report

Static analysis result for SHA-256 24eae915fdd4821b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 21:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 76bb8a213eb1ec4f8a16b81e1aea3dea SHA-1: ca198887b4e6835cbccb772717aff679275f3ab4 SHA-256: 24eae915fdd4821bd0f043c90136cb8174dbbe836e1abe6735a587bd6fcc0150
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Tampering

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a phishing lure. The heuristic 'SE_SECURITY_BYPASS' indicates the document attempts to instruct the user to disable security software, a common tactic to prevent detection of subsequent malicious actions. The numerous embedded URLs, many pointing to compromised WordPress sites, suggest an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://medvor.ru/uplcv?utm_term=download+nitro+pdf+di+kuyhaa PDF link annotation
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a0433a92---mapawebikagow.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/64061890654.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/12855586210.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607024b640cd8---fivotuzejagojenuvexokar.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/44651798803.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xirumiburobafojumonebajaf.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/gofupinetojawajofi.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/vawifoluxazonololar.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/ratan.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/tobononimuxakajuf.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/0e7f774e87d59930fbc829cfbad781aa/wopusizurelunexiviw.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf3eef7ec---sotofikologedi.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbd1e34e86---kupikekiwexigotifu.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/rolirexowibugexirari.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///mumivotopuzez.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/529de04782c79efaa09a208617295f43/tosowunegowakolegefon.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/no1338q6onu9dskbmfdfvl5ij3/zosamukazapopeboworu.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/tawokuwol.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/33894426689.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25792e0939---87985309194.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/70015787008.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/wujivabukazo.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/iqm93t0e5rlhkahta7tk1muv6c/ridiworubipikilifunubi.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8fb64ca73---pavupuja.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/40024245407.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216261977163.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_off0000dda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 19240 bytes
SHA-256: 2b5d1f7358547514c735502e770c514dbff3ad4bf0e0310f5843510a16f3068f
font_01_sfnt_off0001104d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12864 10688 bytes
SHA-256: 2751de75e9f7880a93a3b7ab0c9e1990b82d0e8ba2b127d9313a06ec91ab10d5

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