Malicious PDF — malware analysis report

Static analysis result for SHA-256 4769137fac6e1fb7…

MALICIOUS

PDF

85.0 KB Created: 2021-07-05 02:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0efe139221b81cfda4dd6b48ab6e6c0b SHA-1: 7af233eeceb43ab9dbb0ef36bc8c1f1037e57c92 SHA-256: 4769137fac6e1fb711e58753bc5860709e456222bc9187fc20b0e2941c3feb13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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://oniceh.ru/uplcv?utm_term=acute+cholecystitis+infection PDF link annotation
    • http://hzjksj.com/images/upload/File/51914387757.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609db962dc6e3---17455159467.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/wirajuzumokaleveb.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a8e847f5c90b159eb28c50670ef58f7e/pobapopedalem.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/sebulonu.pdfIn PDF document text
    • https://sce.tw/uploads/files/60b4cbc4cd018.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd77a51e13---vilal.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0n51bf96fialu9evijs6gp5j11/66464693876.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759c993b0a7---wagezupobonekufi.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/b65m6en5gqs1un6jdvoasu6jtg/julapemuzafedezib.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/02f52d86cf887935aa4e48ed7606248b/63281361576.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d3381ff32---penugafenapava.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/jedabupe.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/senufaruviw.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082edc2bb9ad---lewojerekoxuro.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/22110961585.pdfIn PDF document text
    • http://kbchina.de/upload/99594340347.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d83c31316e---xumubezigazap.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/radoleti.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/tewefawozipuburiwawiz.pdfIn PDF document text
    • https://baongochoa.com/upload/file/wivepi.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e762efe5---92824831412.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/3382276884.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b745beaf04c---9574652238.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 10364 bytes
SHA-256: 011a42749dcb15a00657ef8aebba5dfb1652d970259b02d49fb72fce738635b7
font_01_sfnt_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 16876 bytes
SHA-256: 95f7b5a2aba205c3eb7d452bda70aa9bffe9a4b4cc66bbb87d134a9a794482bc
font_02_sfnt_off00012ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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