Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b3b64606c1613e…

MALICIOUS

PDF

85.1 KB Created: 2021-08-17 08:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1bbc18c9d73b2270182a162b329853aa SHA-1: 5a40c010e9a4a44d9612c6d67a49dac1dfc92e84 SHA-256: 55b3b64606c1613eb9dc7a7bac01c14a44360f651469055112aee71cfb962a48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to trick users into navigating to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://seeandhearbetter.ie/img/shop//contents/76250595762.pdf In PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/6hdtpfuoohsku0bg25litn7tmi/sabetun.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/38c3fae6f17a13d4ccfc2372bed2f269/talifuwasokumovevomogaj.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/fibumatawufufizipidiwozi.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/2157385d7e8d38e53daafd320d45d3c5/mubizuxowedonetowevutaxej.pdfIn PDF document text
    • http://envigest.cz/upload/file/penazatevejaw.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/63364118580.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/53336577759.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/3390a385d6bf31c9bc92541b7f1d7738/wologuxurevuzoz.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/69216570562.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/regovuwasoja.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/67739164862.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/dabazibaxexawumanobivego.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/82e5f33e6a8bc1ea6bcc4b6c90509ea2/81190405512.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mftuoej0vc5cjtka0ap0v48t10/95087381676.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/rumoxodonabutuguli.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/70671539095.pdfIn PDF document text
    • http://15thstpresbyterian.org/clients/d/d7/d7025cfb1d4df99eee5a588ecc3dd57f/File/kazimasipuxo.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/2374926179.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f49acf90a---70440848242.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161125eb6686a5---saweregodofifoj.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/39424949922.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/85855240048.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021060307564973499.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a387d647daa---fumopusazakowa.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c3669ed188b0aad0894e5eb7df0dbf98/wasukupututuguxo.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985f0f4710a---rakodakapemodizokizujenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=download+among+us+pc+megaPDF 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_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001018a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018A 10756 bytes
SHA-256: f65433ee55030dc53168d114e4456bbfc2bb103bddd3fdd97e6d2dc2a56610b0
font_02_sfnt_off00011a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1E 17104 bytes
SHA-256: 843d16f1c13b8e4e98892b1d28f2b04bc8f00a750ebbb5cb38ffa5845021eb3a

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