Malicious PDF — malware analysis report

Static analysis result for SHA-256 86383ecef5bd65a5…

MALICIOUS

PDF

77.3 KB Created: 2021-09-14 12:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79c92071232b79b7469843c37ed7f8a2 SHA-1: 81aac19ae1ffdb53ea0a3ecb14e2559b920102be SHA-256: 86383ecef5bd65a5376f8533233a562d058879695778ce3d325ea28cae4e98d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm containing numerous external URIs, many hosted on compromised WordPress sites and disposable domains. These links likely lead to phishing pages or malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=gin+gan+guli+guli+song PDF link annotation
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/kps8r1ro4ak2lcrfibh51jorq4/99264439525.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/kuroka.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/wawepovipanajalevowolepe.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/60358954712.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/60323268045.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/10382601987.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/29786445846.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-11/20210911033144963986.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/gexidiwupobivojediserux.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/43407984999.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/depuwewajejetidenuf.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210904_074706.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210904141754.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/28962419098.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/d948930a90df5f1133de2fc857018fa4/dubaxusavunuvidafuzusudef.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/bomunumituwakoxorupixi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c75422f6fe---19327614814.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/80257932562.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/dofodovaboterugu.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2b69e77005601e5f5f3fd2c096ca18a3/38834752486.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/16097772432.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/96979772783.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/pubesujipuvok.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_off0000c7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 18804 bytes
SHA-256: 7af84a44b5f0b9557d75dc1830a7776f5797b428c950e972f91f806998872382
font_02_sfnt_off0001113c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113C 10092 bytes
SHA-256: aba4bdf98923ef84401cad0e99597ea7b9918ad5b52984fec1d35264406dc77f

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