Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac79ab9e9ee9d87…

MALICIOUS

PDF

77.9 KB Created: 2021-09-02 11:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c440e0f1cff0094c81d7b35befa310ac SHA-1: 5a1bb0f0d13284ee10f0474e28dfbac50de1b6b1 SHA-256: dac79ab9e9ee9d8796c68fe39a8153d75117159806a90f43e76b0b35ebf6e891
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using malicious documents to lure victims to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/xizavisa.pdf In PDF document text
    • http://automozg.by/upload/editor/files/31000914841.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/moloxemolig.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///69202766074.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793023cd4f9---befutavutenodinetuziga.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/67908804087.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608033745fd82---6060613367.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/21175612931.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/rilodilosoxajelubelu.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad00a343c---dibemomawudog.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1af03bf03aebc559fad0121e4a37c713/66463745035.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/94775979703.pdfIn PDF document text
    • http://kimthienbao.com/userfiles/file/59855021864.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4d73634a6---jolivumasekibujaxejamelo.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160caac8c34e9a---rovosajikifigoli.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607219fedfad5---46168227119.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/70259709474.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efd5291631---30092687065.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/lolakakividolujab.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/66642782631.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/79517727259.pdfIn PDF document text
    • http://le383.com/uploads/files/45817161659.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/pamunisoxakesirevorod.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/9bd6d1f76a94809956c314d3b3a03fc4/30835697969.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/9847083889dfcd89f3d9347af46fd3f5/gurosemoj.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/12352892735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=di+fiore+atlas+of+histology+pdf+free+downloadPDF 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_off0000ca6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6C 10976 bytes
SHA-256: 9d7d741a0dd9136762030edbda1865b649e78866f2b3536bad23949052319de0
font_01_sfnt_off0000e3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B1 17672 bytes
SHA-256: 095c55e369bb491270f03c09b56df513955929df81fc7900caeb9ca5ad997f4f
font_02_sfnt_off0001115e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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