Malicious PDF — malware analysis report

Static analysis result for SHA-256 558d0477af43b71a…

MALICIOUS

PDF

86.6 KB Created: 2021-07-16 01:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a894ff405f2381c8eabd54e224abc3c8 SHA-1: ceedf17df56c3e878cf5b686f3071740c8bbe017 SHA-256: 558d0477af43b71a2d30a18cf4147b1932bd756d84248e42231d5e4bed436192
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=water+in+manual+transmission
    • https://armagedonspedycja.pl/files/file/87128427431.pdf
    • http://agendatourvietnam.com/hinhanh/file/43376318153.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb47d858d---dusodedaruwukejivenaf.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca072bdbb5---5600217274.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/c16dea562df3bf32590f51959e342fa4/57189894859.pdf
    • http://bmsorganica.com/userfiles/file/molowuzujop.pdf
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/16932190116.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f7f24e3c40fb9094a26fbb27a19514c8/55005013123.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/84d9a44f97dd6f3fd5af01e64e20b489/50235563049.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/9db1becb3d3a3432b395f570816af1ee/wubovowe.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/e1rt11ft0bk7seh9tbq62tbmc2/54733684057.pdf
    • http://watthaistuttgart.de/userfiles/file/suromivibifu.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/hisr204utt0gh33t4ukovqfk1q/fufeweximotedopade.pdf
    • http://tatishev.ru/admin/ckfinder/userfiles/files/zitonetakekibesato.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074688928cbf---tenezam.pdf
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/zagaladivusixol.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/600c68b71d86144de3a27e4971d40da3/83058072121.pdf
    • http://samnakthodrahassob.com/userfiles/file/41674530751.pdf
    • http://learnersdigest.org/userfiles/file/wimugo.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ae2f5942c---41709908624.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cb00240cc32---40085569502.pdf
    • http://sanphamhanquocymy.com/uploads/files/98938269709.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/b754b94d0f27a03fc4c3ed60f5a0a02c/kezamisododegeforekiz.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/aca9ed847092c2a7992e4c64223f7d91/67612795944.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee437e7ee0a---57609844274.pdf
    • 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_off0000f103.bin
4aba6a9fd8640bb1f07f487187f9787ca5665e5f04231002a300f207d5758478
pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 17136 bytes
font_01_sfnt_off00011dae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAE 16792 bytes
font_02_sfnt_off000135c5.bin
87070017cb533347d71d82f96b48aa50b83a9d6dc76c56d018a7b63be8dc5ad9
pdf-font-stream PDF embedded font (sfnt) at offset 0x135C5 10364 bytes