Malicious PDF — malware analysis report

Static analysis result for SHA-256 03aa046cc32240df…

MALICIOUS

PDF

83.4 KB Created: 2021-07-09 03:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a28b8dc3fdb419ce151fc39d52da289e SHA-1: 371a9279825bddf3ca8a8b20b4b82440466d0111 SHA-256: 03aa046cc32240df39d4a18c51c80f342042caae4cfd03290cfbb8e127bbe614
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating it is a link farm designed to host malicious files, with one URL specifically mentioning 'kmspico free download'. The presence of a 'Password-protected archive handoff' heuristic suggests the document aims to trick users into downloading an encrypted payload, likely malware. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ndmoyun.com/calisma2/files/uploads/80348525823.pdf In PDF document text
    • http://cnex.cc/images/blog//file/44712054605.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/aa807c6ec2c78044bcfd3db880ee4e50/16015985973.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/foraxijefiduditube.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/bogaxiviraxuvir.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/i56pl764tip2j613h2j13ib6dl/zuzuwidusodavixojidona.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/40715433904.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/50068094240.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607afab4acc03---jiwojajisipavivodiraruzuf.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e9d54ac9e4006940fbc68fb3b9402b85/busulunedinabasowanovu.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/muzedosebozisepes.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/90684149238.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/7gmfpv6qacj3h00phi7teroe4s/bagabuvu.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/21635629765.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f6e086c6f---37581966786.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/zapesifejilitosusesomut.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/53920690030.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/nekasomujuzemamine.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60afde85d53a0.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/6cc28a14e5d94b6d80c5461813d34cae/kuwij.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/410f49d5adbd474463d3df38d949c3a3/72001579515.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/39037213460.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c219d9603a---24275936221.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/2a9284586204dfc0cc3e14b699a9f589/foruzirulepuwutonipiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=kmspico+free+download+for+windows+10PDF 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_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 15968 bytes
SHA-256: 2feddd890d002b4394c61a23dd08418679b34ac05d58b8fe97dfba19423b3059
font_01_sfnt_off00010eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB6 10932 bytes
SHA-256: 0fa83ff7338f3d92e890f0fad7ed6e01262fddac2c55fa19b041f5a1b3f004e7
font_02_sfnt_off00012811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1