Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e176e5b5a42b354…

MALICIOUS

PDF

89.7 KB Created: 2021-07-02 02:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ba6ad55d4781070c8d6a4d5163b7f64 SHA-1: fbbf2b663ad1f00e4378dd19a9b3472f4b148f52 SHA-256: 4e176e5b5a42b354dbec82b1895c804866d18145f69c9517a54fc35c96c08992
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of numerous distinct hosts and disposable hosting further supports a malicious intent, likely to distribute malware or facilitate phishing campaigns.

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://kalyna.ua/sites/default/files/userfiles/file/26280980377.pdf In PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/tigixijaniduxeruzunirobo.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/d3572398a2d8da1f88b07316e9244e69/ninelaliderotifogugot.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/49470820096.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/nudelowukavusupanusevaka.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/41200043942.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/90741281908.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/41991306ff9886e33eed64c41e5d7775/44178980642.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeb053c73e---jakunefibokufefomumenib.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608977be65408---gisojituke.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/67978508097.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/66001279967.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/82625338871.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/670290b20691a0a87cdf5bf8f65c0010/mofonitopetapusuz.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772d3e05337---xajisoran.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/3rvjnqovnfo0tmljmikf280184/josusodinibepijosexafofab.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/99210310116.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab22704e0---68185854736.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/q39oveutrcg8lih92s6rht0pr4/36264670635.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929eac5662e---58265899339.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/jowivawaxuvakusekoruvexo.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/faefbbe6ff356f1ad704a4b731c294a4/68494720633.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/8406d2e50bcd87c984fc86569affd38c/45375141646.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/4ae9ab3c1e4176bd32772658b3b851af/47979370676.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/dujawobuwebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+long+does+smoked+salmon+lastPDF link annotation
    • 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_off0000fc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC55 10568 bytes
SHA-256: 2cd1405ba97b10cd332d33a67850ada62b259454a1b5e8661ebd390b34e3260b
font_01_sfnt_off0001144b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5D 17560 bytes
SHA-256: db0239627831f91efaaf138eaf15c54f9bd67c547ed5613038d3d1f40420e57f

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