Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c10a9dc08ff4d22…

MALICIOUS

PDF

72.1 KB Created: 2021-09-01 16:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f3a6c338e9a296ef4abc31e1b3e4d25e SHA-1: d297c6cbbe4975424fce2109a8a1773e23e9959e SHA-256: 3c10a9dc08ff4d2279f60d13b0aa2da704cbf06d8b118c36fd5af7b216c62bca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, many pointing to potentially compromised WordPress sites, indicates a malicious intent. The ML classifier and ClamAV detection strongly support this assessment. The embedded JavaScript likely serves to further the malicious activity, possibly by redirecting the user or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sheenabusesandcoaches.com/userfiles/file/43469850781.pdf In PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42d831c607---kiroranitafo.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/857dcbcbe902adf6870304e0c9999492/23929260068.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/sebinasixezubudati.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/jidezekobovajazijobi.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/88591902714.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/memaribiponaremusawen.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/tepinolejozaximivo.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/ca3241f65a17051c070a11a2529e0f1c/76317310114.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/40063513819.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/54221e59285c136fdc0298b41ee5327a/nebepazojoluralabosile.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/5b771d934a6dd1c8f2031418839b03e8/jufezutoxiroximupu.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/ae96be28bc404ab8f4a59f547e08ac55/gerafetewixifolaf.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/jetirudobomulafobefor.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607805c25fad8---dibebemibugevunipup.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/wagitavigoj.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833cb732262---44355791458.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a486db7cf29---4655558680.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/45643422a19af8f9cee8fe6a0af7c82c/kebajoboxulepajubusu.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/9bag9qi4iprf4g23dj1usnmk0h/65421189643.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/46161148019.pdfIn PDF document text
    • http://mutitar.com/user_img/files/51323053459.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/87509445299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=just+woke+up+to+thisPDF 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_off0000b8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D9 10204 bytes
SHA-256: b75133d28a57099e495d28b30d2d57e69919eee914a2dd58babdf4f8c240d2c8
font_01_sfnt_off0000d00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00A 16752 bytes
SHA-256: 7ab2f2577fbdc15696399d12ec815c77e9340e8520c17c0827a6194df7d763ed
font_02_sfnt_off0000fb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1