Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d843644e39c0a56…

MALICIOUS

PDF

76.7 KB Created: 2021-09-07 09:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 648e3480de0113ba8666e3dd5993d4bd SHA-1: f9fb22b0afafcc56b07fdb87ead3bd60c4486cb8 SHA-256: 9d843644e39c0a56f540d6756dd1a4dc93d142bc89fbc478477a3b9a54bdc575
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many hosted on compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external 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 https://chp-travel.ir/data/file/digopopotubak.pdf In PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/8884d3d1a0c2e323e690ad9106a2feac/xujupekenirir.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/natabebujizunuxipaguwo.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/tovolaxaxeg.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ou22kuvgi6cv8r8dv1forh7l7s/najopi.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9eeb3853d0---simirifejinuru.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/80606088435.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/naraxotet.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adba1cb69bb---2219087053.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/59328968250.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/zirivasen.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b23a390ab53---70909762103.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/sesupotoropij.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210831051400.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/6f99031282d93a65676a136df3578f04/68693424378.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/ead1ce7e4e921277dec147677b5f12ff/74679674355.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/zewifufekifose.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16109a955730ba---80952892262.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4ec3a9743---7667992762.pdfIn PDF document text
    • http://tidomusica.com/uploads//files/202108090617354727.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/gevenujusamoranojud.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bb69a748a---13715247460.pdfIn PDF document text
    • http://huiking.cn/uploads/file/260929168697.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/sozisel.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/baluxetalekifon.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/dc6jcp32en2s384tj243d8mcrd/bikodopewob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=dodge+caravan+2016+manualPDF 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_off0000c6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 17056 bytes
SHA-256: f883f63eb37362395e0e423fa7254cd1927bd8aa21c947051128c468921cbcbe
font_01_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 10984 bytes
SHA-256: 72d554bcb5f8e29e5ad370ecdab88e5c5d04b9621808399925d28cb834cc495a
font_02_sfnt_off00010cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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