Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33106101956cad2…

MALICIOUS

PDF

80.4 KB Created: 2021-07-27 06:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02064ee61bb66440acf0cb032b83ca3b SHA-1: bc4e0ba0c80194c896c4d6a85ed802801ca4d5db SHA-256: c33106101956cad2346768ca09e179be25ab2da4ac4b58175c0c905be9f32083
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6637

Heuristics 5

  • 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
  • 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://p99.tw/pro_pic/files/barusivuxamafifidigijijej.pdf In PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a426e77e6bc---39744754778.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/80436806157.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9345e74922259fb7befac31a2855894/84200899328.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/wilirugusagudifuri.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/688b3f818e751b945bf28ea36b61ddda/54674796620.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2f9b2c99---wilupigumevogex.pdfIn PDF document text
    • http://aimic.com/userfiles/file/famajuzumine.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fbaf54ff6ff4ec027d35b02758713371/fojoxedadesapumemig.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/vomaviravedevumaxikune.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e16fca460b---20232311498.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/boseraxubilifegupewilag.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e21b1342f---fegakolenozifuza.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/72367229980.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160797b49d47ec---mubenukekumipupakobonaxe.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/kejazudikodagikipin.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/77456632953.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913ab3c35cf---kipaxewugufiludubivufife.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/tivemejovezomemi.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8681e35418c58ac3a61c08717b2204c1/momiwelikefopokapefuza.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/2268315145.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/9a2518648519705fa8cc3870b599399e/83076831876.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/8b042744f2670dd38daed1cb39b2a372/68668012140.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/482011386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+i+get+free+fortnite+accounts+with+skins+chapter+2PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AF 16288 bytes
SHA-256: 59853eb786dd6851160bbe591d845baaf98a82e3c28c150bd4df265bc76f347b
font_01_sfnt_off00010eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECA 19292 bytes
SHA-256: 28a443974ce2fa5756e8a5f4178bf34eb2b611e9837580b78ff20b5bf1bee6aa