Malicious PDF — malware analysis report

Static analysis result for SHA-256 63fba7f516cd7f83…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 01:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 573b73570d4e7c02267e3031ceec634c SHA-1: ff9bd0f74a718ae8f223fc192f425126739ab44d SHA-256: 63fba7f516cd7f83f2ce8c633d344b3f84a3fb9e05b6c1505a38ed3089aa2a99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and disposable hosting. The presence of external URIs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://irlanc.ru/uplcv?utm_term=finding+midpoint+of+two+points PDF link annotation
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa318360df---77450216339.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210810195058_297813229.pdfIn PDF document text
    • http://accronline.com/userfiles/file/karupal.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/zabomuzitofokejuged.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/b807b13453a821a7eff16ad4001e10a2/59907721492.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/21390321745.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/33003653273.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/neroneketexof.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/86480105495.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe04a43c2---95322296672.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f76fdaf30---94864255639.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/zemabaviwizadubatuviko.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/4d304543ab5b9e4777742b51d411f308/4933511270.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb74d84dd4---gewijifekuz.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/98054582110.pdfIn PDF document text
    • https://discoverthesky.it/file/27371621348.pdfIn PDF document text
    • https://mmszke.hu/files/file/zofejowutukuvoxuso.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/51047750406.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/33f4bc8a430bd397453c95d807ab7135/82863718916.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff2ac5e20d---77010556436.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/81359461948.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075f23c8859d---37902866604.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/girorileju.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/f7412458071d8336e5454aa641e221bb/tosunagemusedewe.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_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 17940 bytes
SHA-256: 74aa12efc58e55415ef6e6aa8c7d9d510fdf3454f5eb6e59e0e4bf30f6bac0f5
font_01_sfnt_off000113a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A7 10464 bytes
SHA-256: e9ee471e8996037b1f5ac28271c34085713be2f8109defa0cf23ac6c19887639
font_02_sfnt_off00012b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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