Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddff07c351affdc6…

MALICIOUS

PDF

86.1 KB Created: 2021-08-16 03:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f7caf64f935f679ce292e3bf3b6af7b SHA-1: fc06889ac8e0c371710a278c7953e047c8f64042 SHA-256: ddff07c351affdc6cecd37aa5e489e94dcbca53197cb682ce3b62d6976789db8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, strongly suggests a phishing or malware distribution campaign. ClamAV detection and ML classification further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.vignolaweb.it/ckfinder/userfiles/files/gesuvisebudun.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e7a241bd2---78420273599.pdf
    • https://bititechnika.com/uploads/file/julabanopa.pdf
    • http://kartywspomnien.pl/uploads/assets/file/fizisiwep.pdf
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/miwuz.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce6ab936c---73538857524.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/be4ecd6c47492f62056fdbfe00611ed2/62987809441.pdf
    • http://versobrokers.eu/userfiles/files/33243983389.pdf
    • https://flyingfish-stay.com/userfiles/file/52455765037.pdf
    • http://apluskleaning.com/admin/images/file/41900903314.pdf
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/93450982976.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/75e339876be099b55372eb9db4f390c2/14063126231.pdf
    • http://www.jindatunnel.com/up_files/file/77250240984.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fd04aa528---nigagivemofiraven.pdf
    • https://abouelhoulgroup.com/userfiles/files/98727635035.pdf
    • http://fouladsazanco.com/Upload/file/kutosebu.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a638279f7bd---4285746742.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/b076ad291b82233de95bf18e403d79d8/tizemamugiv.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22e3e2ba17---41936358760.pdf
    • http://finpacecuador.com/userfiles/file/debanas.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=james+baldwin+no+name+in+the+street+summary
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb74.bin
ce799c23b60df44987b3b616566c9b1945757bc9a437a2a093e20a207d049830
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 16744 bytes
font_01_sfnt_off00011730.bin
281869292c9798423d95fc791667f882005e3f3d97bfaed4d7a2493bde88e448
pdf-font-stream PDF embedded font (sfnt) at offset 0x11730 10944 bytes
font_02_sfnt_off0001306d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1306D 16792 bytes