Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b55e61b2e0e7f77…

MALICIOUS

PDF

88.1 KB Created: 2021-07-01 12:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42f380888291fbac99aa7258deef123b SHA-1: 3bb0326cbf134fa2ff648d9951a13aa5e75bc816 SHA-256: 2b55e61b2e0e7f775feca19e88956b98eb9527202f2901182b8b8ad40f85314b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it exhibits characteristics of a password-protected archive lure. The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute further malicious content. While no scripts were directly extracted, the presence of embedded URLs and the overall structure indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://bjjiffy.com/upload/44642637882.pdf
    • http://dges.in/userfiles/file/jejisosepodusarafu.pdf
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/42619851696.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/9unr6n3h0suktc45eh1tudattu/bobijip.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1efa361d1015f1f36a93467966f6cf29/65060849521.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c29cb2839d6---joxifotul.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e6ba13d7f---23303848293.pdf
    • http://ibb-online.ru/f/file/bavum.pdf
    • https://sbufficio.it/file/tekajavog.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b31d84d55---20876281461.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/bbd90997a48d10e3ee3ec930d6890463/lexugikuxadeborezesavavu.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607998933a36b---nazijetemusem.pdf
    • http://andlupa.com/userfiles/file/wozoxololevexilu.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/08e9e808cd90ebd8b92c9fd2805b3d49/dubiru.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/8c1168dcac86ebd3c8639531293a9ec4/dujidep.pdf
    • https://lawina-radom.pl/files/file/19415155445.pdf
    • http://laiyi-art.com/userfiles/file/59187843057.pdf
    • http://allprintusa.com/admin/images/file/limibizup.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37f7838463---sakiwivatipa.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d3e4b9e0c---71345382681.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/d7ornh8rsebcbs861qflaiqp5h/87407532197.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6206a6216f9cbb505cb877feb73351a3/91370492399.pdf
    • http://dh-cell.com/ckfinder/userfiles/files/47592455512.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/7519875546a8ab64409d71b2dd353b31/20016051708.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=redshift+active+directory
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f290.bin
616ba82e1cb70e717cea4e81d78848a8d7a3d12352a78e269a9ac9a9163fb9bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 18204 bytes
font_01_sfnt_off00012276.bin
bae9ca4344b9e315366f422a3bafbc0a9d6bcdf23c236d97db27d285cd391b4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 10648 bytes
font_02_sfnt_off00013b16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B16 16792 bytes