Malicious PDF — malware analysis report

Static analysis result for SHA-256 927044a653b1d604…

MALICIOUS

PDF

73.9 KB Created: 2021-09-05 07:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8298043acdde49815746d5f3920d6c03 SHA-1: c3c5da832dd6168dbdaeb1c37c2e4d684e8bd4bb SHA-256: 927044a653b1d604f5675a18282e4077b83e22ba53602452e159c7df1e0474c5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that redirect to potentially compromised websites. The document body is unreadable, but the presence of many external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://micro-churches.net/uploads/file/64235418013.pdf In PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8895dc61d---50818256.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fddb681177---5358660644.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/fiwomasutubabajepojevagun.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079725f387fa---favalelokodinaxow.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f1f7dfad4---mikaxokifujeduwimanosazan.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01aef86cd4---ximuxolafuwewegonowa.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/xiwajopazijiduzuroralop.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/waluwoxijivuzadexet.pdfIn PDF document text
    • https://ahha.az/userfiles/file/xonusejikafidepowibodoj.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/4cbf1b3f880e85c6f32f6f1393222125/sipilotoxolixigi.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/e3c80b375c9cb7e7a1af006b8d899280/jinugaditopironazitelez.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/dodojifetizimemuliruj.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/69551294871.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/e61a2a00b9ea7d08d3956504d1341310/mesafeveluwumur.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a036358e4a4---wufizaluxeweg.pdfIn PDF document text
    • http://proxima-online.it/public/file/fukelogire.pdfIn PDF document text
    • https://starbox.fr/img/files/40509063691.pdfIn PDF document text
    • http://modern-pro.ru/files/file/piserutuvepudijosalilimo.pdfIn PDF document text
    • http://mebco.ru/images/file/37101890216.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/53974469710.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/ac69bb63c7324dcef50bbf7561538cdc/65338164517.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/gusozadujufanib.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/matesumipazazuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=strategy+and+statistics+in+clinical+trials+pdfPDF 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_off0000c003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC003 16036 bytes
SHA-256: 573de37378f2e37e33d96b5098f31272e1f9fdb72274c2436a2a111e7b3aab2f
font_01_sfnt_off0000e8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 10864 bytes
SHA-256: 5769bdb55cf2b0db08b6679ee585735cbdaccd7a63f0fe7608ab2febcfcb94ab
font_02_sfnt_off000101c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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