Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0f6e773c3fd810…

MALICIOUS

PDF

87.5 KB Created: 2021-09-07 04:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38daa5dce5fc0d172c9edf66ec1b8ef6 SHA-1: d4a2eba8942cfa6562af16e696f42f88daf45bc3 SHA-256: 1c0f6e773c3fd81091865173a18081496d5e14dab319db1c040a196a8db6774c
204 Risk Score

Malware Insights

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

This PDF document exhibits multiple indicators of malicious intent, including a high ML classification and ClamAV detection as a phishing trojan. The heuristics indicate it functions as a link farm and attempts to lure the user with a remote support tool pretext. The embedded URLs likely lead to the download of a second-stage payload, possibly exploiting client execution vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=manually+install+plugin+internet+explorer+11+windows+10 PDF link annotation
    • http://divodizain.ru/ckfinder/userfiles/files/64724254263.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/zovisex.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/58193556060.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/rixetozekogurakowosaj.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ae51f100---fumexopimaf.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/35fa98bf1517fded6bb2483d3b3de070/dadusarapoxeritipuf.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160983bd0c1cd5---8266844906.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/radejotomodak.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/921fatjm2jflhl2vqj2v9q7706/xoramotuzajugakigojol.pdfIn PDF document text
    • http://runo34.ru/attachments/file/datirer.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/62507578131.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/lisafawefegasite.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/danafulepupepepup.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/futf7juauqstrbtkfvo9l0k4p3/bipuzepiwakaru.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/238296d14425a53c0de8e23c7f2b77ca/35857382295.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/pulebaxivuwevumesimagere.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad7ba3f244---zukojuxemed.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/rebewowofitat.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/sm1vrrc24tdt64cjb9qg3ronhg/39884230829.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083dbd1c6567---vanafofumixevulowaralej.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021061110473580554.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f0e1feae7bc72a7870cc0096f94d3aa/77818963122.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/39501018643.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/pokewi.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609644a3de9c4---xaxutaviwexikawukomivojim.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16111cf3f4d702---wixobuvenesopanedexena.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/vataxugorovotewaridefon.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_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D7 11136 bytes
SHA-256: 9a6f3ba8a3e2ff7c0e63c7e205d0bdcddfb09607669026311a82f6b474136190
font_02_sfnt_off000122db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DB 17100 bytes
SHA-256: 9da0b135e5ba8ceeb07bf3de47998ea8194632fb2115776a3320c01d68bcf8d0

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