Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4f4948ffe1d3b9…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 23:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1c882da38cad33d6433ff621324cf519 SHA-1: c0d81d68c6e55d48b4ae8aa23b4c867e523d3fa4 SHA-256: 1a4f4948ffe1d3b9018a591aa0a932f7cc48b84b9dd098b24fdeb5739eed04fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure suggests it's a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://imagebeaute.fr/userfiles/file/nelelawasekozefejolokomo.pdf In PDF document text
    • https://burstallconrad.com/editor_files/file/16612068198.pdfIn PDF document text
    • https://fuoriscena.eu/file/75708624278.pdfIn PDF document text
    • http://stylekd.ru/files/nemigegosidi.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/bowame.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7cc95a25b---pejanatuseselozorefer.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/9f2a9870c54525f95979b1ddf8bab463/xigok.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/wukekoziwiji.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/gegaxuwagodolon.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f89bb5acce---68271562448.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4110e2c12---redunefujawakobilonapab.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/644790c2fad23790481a608226a623f5/pofudajaso.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/40561608636.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/76301460170.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/tojotobafir.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e3cfccf6b---95775828793.pdfIn PDF document text
    • http://diodelumi.com/ckfinder/userfiles/files/14734815954.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e6af052686432658f802e23365cab3c6/88308161122.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/92287163887.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161010a38c1337---51301053346.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/8e3f57d5ac27ff1a36663f0746444852/wuperudatekefedepazo.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/80768498167.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/548ac1dc56c7b866937513c7081a8f58/gabijafukusokuzefixevaz.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/malotanewuxota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=soleus+air+dehumidifier+manualPDF 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_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 17572 bytes
SHA-256: 1666752be46aa6c7d26fbddd7422685d1bd85e3fbead191b264f4df635a3b6ca
font_01_sfnt_off00010770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10770 10696 bytes
SHA-256: 5f9ae05ff629dc7a8ec8ea58a611cc26894c47b3f8553e874b6a6772c4b9f215
font_02_sfnt_off00011fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1