Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca7df435ce0d8ee…

MALICIOUS

PDF

72.0 KB Created: 2021-09-02 02:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6c31ea837b000cfba47cedf17cd93d18 SHA-1: 4b08903346117cd2132d93db5db5a65eb206aa42 SHA-256: fca7df435ce0d8eeeb6e57b6e089de3c8fee613ec8641ee2516702f6561344f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://vongtaygiay.net/media/ftp/file/4458927449.pdf In PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1e1a5b980---90452151860.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/3c523a8b91252a040046695fe3e1d9bc/50765467861.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c2694a654b0d9b36687d2001edb73a79/vopasafesumuf.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/11126b15d268ec2d1ddc7099dd5f4e07/kukumitas.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/gakikivor.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6bd8bd76e1---wesum.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/siruzekuronoxijokixi.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160833c9758450---49241159444.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff8700428c---nekuxo.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/gr3l2nj0br53m50d10rig4nehv/zexutefixug.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/fia8v3ru58i06tkr837iumevpt/43891887791.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b037cdbe---ruros.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/nh0s4m579ho1eke3g4gf86f4ml/48243415524.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/63419452428.pdfIn PDF document text
    • http://alkanboya.com/files/file///lazafifij.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/70887badccb3b430bf2faac63ae1df2e/salinogifenikokawa.pdfIn PDF document text
    • http://isvpro.com/custom/files/99316355447.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/f59dafda476473f52d1b1ab66b539987/wimonupojuxerudaxapog.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/88499733177.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/87944898467.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/b8ae7d10817f84abc986046eb8a6702c/pebudopafinonax.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/vakozavonafujelugajoreri.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/67018795143.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/lajoxibarirosapugejinam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=conjuring+1+tamil+dubbedPDF 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_off0000b75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75B 10876 bytes
SHA-256: 46b8b9699bb7a4650cb223e86b52a71c0fdc3808f465ed000245f38e79ae1b8c
font_01_sfnt_off0000d043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 16400 bytes
SHA-256: 2ff6969c14f9d67ca6297cd98a6ab82fa5ce21651c72549cdab8e72cb5ad685e

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