Malicious PDF — malware analysis report

Static analysis result for SHA-256 9390319ff56caf32…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 20:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cc2f789154801cfc853d636a0984d67e SHA-1: d805c456d17b6fe0fa53619a50e30d6283c2f42e SHA-256: 9390319ff56caf326f3a168520732d35c8872ac5df6501457830cbca0929667b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=bts+world+game+mod+apk PDF link annotation
    • http://falconfam.com/ckfinder/userfiles/files/potajigufarerinoka.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210912/files/20210912224601.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/xatisarewajojorarexabep.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/37010909750.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fca718375---guriludodo.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329868c39c8---19657732653.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090910081988.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ed2098e104560869f09e790fa38c6f6f/45295393701.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/rpevh4h3rq38501ffomjm7s7g9/46814006886.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/sepukiwefuz.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/ginurew.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/sotob.pdfIn PDF document text
    • https://brukspec.pl/upload/file/75983363650.pdfIn PDF document text
    • http://bibikid.ru/upload/81518949890.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/nevusegaja.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/87995585300.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/20553938687.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/75660494685.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/sanubomaboxopez.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/41214684026.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/bogir.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/36807110578.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/51086328875.pdfIn PDF document text
    • https://rakbah.healthybitespk.com/alpha/ckfinder/userfiles/files/peniro.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_off0000afc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DF 10772 bytes
SHA-256: daad51ffe441982b67ac6e8fcd33a0e05ca90b6752d5ec496a86ea3b866da7cf
font_02_sfnt_off0000e09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 18440 bytes
SHA-256: e92cab117133c21b7c88ff42d411dbc1e07d88d4bec4b9076d78b7d65432d546

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