Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcdc19542fa14c7…

MALICIOUS

PDF

86.2 KB Created: 2021-07-16 08:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72c1e7991a6a8c14ab25593b094a575d SHA-1: 21c9ff026ee9ae3f42b746b58c7e494d4e549220 SHA-256: ddcdc19542fa14c721c97f385f84ea062f178a8ad661ceb9d0b8f801bd507ce3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to redirect users to malicious sites, hence the inclusion of T1059.007. The primary attack pattern is likely spearphishing attachment (T1566.001), where the PDF serves as a lure to redirect victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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 http://modellszerviz.hu/userfiles/file/97491059828.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0dd1a416b---59904680172.pdf
    • http://chinazzjx.com/d/files/73211089540.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609852a0ebf96---20341226350.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/5kc0gkb5eujc774fsj9hte864u/wixawanul.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe77ccb696---marekilixi.pdf
    • http://bebelino.ru/userfiles/file/39762060604.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16085855cbc7dd---64499178126.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/somesew.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/s7tegie6gsp35gb7jgv02eulua/15200335288.pdf
    • https://joebalogh.ro/imagini_ws/61112073474.pdf
    • http://indovinandoilmondo.it/themes/userfiles//files/xigasozosu.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098375f4ebba---79034408134.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8d69c0aa2---132659779.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30717bc1f8---firemofebadilobuvigoru.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9c752b560---48654955443.pdf
    • https://mobilieroccasion.fr/uploads/file/tekifeme.pdf
    • http://www.mostenpo.jp/userfiles/files/871998048.pdf
    • http://ros-grad.ru/fck_editor_files/files/64244610592.pdf
    • https://synodradomski.pl/userfiles/file/vajigenebidojobovenaja.pdf
    • https://goodluckfishing.com/ckfinder/userfiles/files/muwositazupu.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/51677560189.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/1694020f533d43528823b7355001a5e8/81086054626.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9paq5f3ai316sdngtu7j191pk3/wujodato.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=calculating+velocity+worksheet+answers
    • 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_off0000ee27.bin
3af5c4fd7c19119622d809c490349b8f40fb4b74a70b26362d4389c6209383e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 16720 bytes
font_01_sfnt_off000119b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119B9 16792 bytes
font_02_sfnt_off000131d0.bin
185da86e6b9155e96d321857acb8824aff050690f15602f5ac232ec30adfddc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x131D0 11000 bytes