Malicious PDF — malware analysis report

Static analysis result for SHA-256 e280f38d2036b506…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 06:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7fbf57ced9a984ff855aec1b94bb9f4f SHA-1: e2d10316c19537bc61fbda8b30cff7b80ad2cc5b SHA-256: e280f38d2036b506cb0a7a2294eaa4bbebbfec71e2a59341f69578dc90fe15b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress upload directories, suggesting a phishing or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://chcial.ru/uplcv?utm_term=where+can+i+watch+norbit PDF link annotation
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210910173718.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399675d1ea0---mumetapotevamem.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/29132956689.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e34042fd64---63985778682.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7e460df02---xodafegaxewenozepimip.pdfIn PDF document text
    • http://risme.vn/files/99177952463.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/vuturelozupepavujedurox.pdfIn PDF document text
    • https://digireg.dk/upload/jadesizugojikenax.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/ludanudamemafabem.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/nhvulcnba9mu30e0pqoh203ahf/pamotovuxixalafaxepi.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/xawite.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161430ef453c8f---mofojapevototikaxevawi.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/4090514170.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/72297953588.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613be0e2cb9f9---43844619396.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/murimilafomopujinidume.pdfIn PDF document text
    • http://juncheng.tw/upload/files/tubapaxurepulibuw.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/42160762411.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/wudasovixoziguxisene.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e678e6f08---dezefetadagigawuri.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/ruvafos.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/6857024863.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/zupadebazu.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/vuwefem.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1c8e059d0a3d49a8268ca6e1aa6e6a64/65957261770.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/tanowoveneso.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_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 18340 bytes
SHA-256: f089117f0f90fdebb99ee3a3bda3734810850ef387e98caa2f76057dcdd4d90e
font_01_sfnt_off00010f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F79 10332 bytes
SHA-256: f99a805d392bb948ab280a00c71632cec521b82b8167f50f17cbc2a3717f4783
font_02_sfnt_off000126ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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