Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33ae3952f9b50b1…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 05:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0214126ff0f5b9254fc93e5387427fcd SHA-1: 30951c4f9515e7559b590854c92367a4f3172d8c SHA-256: c33ae3952f9b50b1a5ac92d4394b058d2df9ca9a5eb61e969a7ad35213b98adf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=nova+legacy+hack+generator PDF link annotation
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc624d19c---fuxafi.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///jelifise.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/rizirejomezarakelamof.pdfIn PDF document text
    • http://badgerhillfarm.uk/xefotoromonikoluvupo.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/dotuda.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/964660849.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/newojonabakenetisa.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/nejawuriguwoluwasizuwovar.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/romatesiruguzitara.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/ziput.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/33ca95917b1732e545d13799a6dec4e3/427829902.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382ec032a5a---kirodefafebedunukizafaz.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613239756bf82---35006994595.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210901175748.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/38974254753.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/wozimuradavak.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/81560065004.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/2698906935.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/jupitanu.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/wabivuwesolu.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/31139116148.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/94056852996.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kevapitokenitofun.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/96140468148.pdfIn PDF document text
    • 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_off0000b4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0F 16660 bytes
SHA-256: 344b0350f5dc7b11454b7787c0d9b0c8bfc47d2b5603cde8cddcfacaf7876232
font_02_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 10500 bytes
SHA-256: 5d2f5c1ff39fdf3c0a423c5129fcd14615fac2bd02d852220cbad2ecd08ad21f

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