Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b135e1fa476a7f1…

MALICIOUS

PDF

85.9 KB Created: 2021-07-28 02:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 88377906405ed35a4eeb0a553ed8f172 SHA-1: 53125b177229d4d205f3385ecc785928d58df68a SHA-256: 5b135e1fa476a7f1f20637f669f71a2031bdb9df57c02f161bc7564124540f8f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/vb2pmgehs5sgtl8dt3ikomv26v/sewiwefajilelabulem.pdf In PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/bvd50vp0j9pd100kcsanllb0r0/57143595709.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/pojosuxizikanixik.pdfIn PDF document text
    • https://blogsma.com/files/vanimexiwagalukuk.pdfIn PDF document text
    • https://rajaunited.com/contents//files/vowavosofuresorokenofak.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/sinokebaxuxubesulivi.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/40686438121.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bf475b1a0---48231743781.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/87670270764.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/bc791f3ebdc02e85e7a14752affdfa21/xibejawe.pdfIn PDF document text
    • http://asustainable.com/global/file/35240148718.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb62d5de8---58522240682.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/8ftbngopb1om3oanqs164lqt1t/posuvuwaruti.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/juziwojixejenimor.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210716_70ADD9A1FF831BD7.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/q73815tp947g0jsi0dd8f41ju3/tasibim.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/62255844411.pdfIn PDF document text
    • http://fabtur.ru/upload/files/kenefaboruwokomifobojosa.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845333a676---wufebosobu.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/qc48qquomj076ecqo7412joqj4/nuliroludoxevujikitugun.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/qbtovf7nhvmnqc99mpoci37s69/novegukapuw.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/pomesavudimajunarini.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/rifisofizebekumadekipolik.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/rixenojanevizemuj.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/alj32srbpflrbu5oik4nct4o40/magepenikapetatotoxa.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bae666f3f80---32578748791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=weighted+decision+matrix+excel+templatePDF 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_off0000eb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 17216 bytes
SHA-256: 68e9c57053bc8250b5af4483fea67028379ca80f6a09aa92554543476a26d99a
font_01_sfnt_off00011820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11820 11056 bytes
SHA-256: 1303681b139b849bb4d184f5ba2532ac0f777fea3389da9b468952b47581a35c
font_02_sfnt_off0001317b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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