Malicious PDF — malware analysis report

Static analysis result for SHA-256 743a1973a91e7e0b…

MALICIOUS

PDF

87.3 KB Created: 2021-09-18 20:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df1899266901185b37916d64944a7241 SHA-1: a73df698aabc88775d394a60e297f2f7ba09d064 SHA-256: 743a1973a91e7e0b6a53a48af1860fc94fa2979cf8e8a03cf39fa7fbeae2f67a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://holidayinntorino.com/userfiles/files/10550559261.pdf In PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b978da48a1---pomexuxa.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/724845668.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090300122818.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/wesununipofomadovade.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/89909055930.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/lavafopavogedorono.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/9225305897.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/5291939351.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/66046760764.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/puxexu.pdfIn PDF document text
    • http://videocycling.info/files/file/bazogun.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/17764182833.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/457a871fb147ba7e9fdfc8a5049856db/bafinopugipexezazapeti.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/satumadinanaraxum.pdfIn PDF document text
    • http://headrepublic.pl/images/files/tiloxixusadubivesijuxepej.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/28295004280.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/lemekifepadut.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/41268991611.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347796abc5e---13100410670.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/dafile.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-4/20210904055721305619.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/59620749243.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/kumakenanaputigo.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/5684992353.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/vupadazazisulapijis.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/71298927796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+download+gta+free+in+mobilePDF 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_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 18060 bytes
SHA-256: 2033329777317e04ed115e035fd92d750b096a75c8c2fa590d5119f364ead664
font_01_sfnt_off00011eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB5 10744 bytes
SHA-256: 6ae9641951da4eb696e40d3196b100bf5b518367e66043dc2ab1260162b8d35e
font_02_sfnt_off0001372c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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