Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4b03ff030e7625…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 20:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3dcc315d52d64bd47c14b0b31a318840 SHA-1: 278d1667ac324c95e189f4ca253001911693645a SHA-256: 1f4b03ff030e7625136d46db0fbea5923c289a8c188ccdc6f54d65ee79200cdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The embedded URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=aksar+2+streaming PDF link annotation
    • http://orvosvalaszto.hu/uploads/files/fezafuloduzabemujemevedi.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091617260770554.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/75291517582.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/rixivujodu.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/58958345178.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/94773371517.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1e5f449cf---38225819608.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/78326594568.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f2c2e21363ceb4691affba8ecbefad1b/vefusezetaxadujetas.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/90451283007.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613480e7b3396---17567285270.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109160342299066.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/woduxigitokezex.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/sagulewo.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/vogunogurazuw.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135b6beb67f7---bokowijavajefosin.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a4820b7fb---mokuwozofeximeni.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/28253025144.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/zuwoxolobexe.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/56823960042.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/xewud.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/65730abce640d2fcd55c9bd910f846d1/20313526267.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///lavabiz.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/sijirokagiropotevefi.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/35eknqqoddbufiudp53oeo137r/2209707655.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_off0000c068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC068 10480 bytes
SHA-256: 590e9af26a4b1ba187be70d8f44dc8a00e019994cfc46c948edf7b6c7ed02cb1
font_01_sfnt_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 16248 bytes
SHA-256: c91ffba6f93c6fd30e5171ca8fae7e10b0a187591f8dfdc455c0fe947b27634d
font_02_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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