Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33e0a7274632cfd…

MALICIOUS

PDF

74.2 KB Created: 2021-09-07 00:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 81c83204b2533db6bdfd854a862df3a5 SHA-1: 4c55ffa4bcddd607b7c7cf9708770ed6fb853dfe SHA-256: c33e0a7274632cfdeeaf20677ac6e41aa817adadd576e9f6c535919836b2433f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a significant number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of numerous external links and the PDF structure indicate an attempt to lure users to external resources, likely for phishing or malware delivery. The `utm_term` parameter in some URLs suggests SEO manipulation for better visibility of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/180de3efced2c49054634b5e35727478/56571452418.pdf In PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/79744930881.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/mejudukusa.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a3667330138---89638665756.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/zofofezekisasik.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/14037778162.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/55803658229.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b03b250fa41---nalemotofexiwiza.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/82263761545.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/wupoteb.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/tasoxogubidulovelilosino.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/xupabuxedot.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/b21086e7b14ae8ea2621c35b832911e7/gelepegukowa.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8192c42899---jejukadoku.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6b204a2bf---64051867930.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/bisefakepixegowadoniwo.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/rabasenewakifuwufa.pdfIn PDF document text
    • http://coffee33.ru/archive/file/tunirurix.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/o8q11b0ogucm25rsirb1p9rm63/lurofiresatenopex.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/ca1add171ad489dfe44a16bfdc22d308/votug.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/50819833474.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/89875075882.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/276944172.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/zoxapejegizudakivegal.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7999230e8e---28429740012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=antidoto+de+organofosforados+pdfPDF 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_off0000bed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED7 10608 bytes
SHA-256: c9a6ec2568d1ca45f9446d78ec4db5e16c4a187d26e391ebfda5241bce932b76
font_01_sfnt_off0000d700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD700 17584 bytes
SHA-256: 6bd9c2bcac9e3c4c5aed9f73725c6f379b3c520733c6ef01b1790a0fbc735df5
font_02_sfnt_off0001036a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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