Malicious PDF — malware analysis report

Static analysis result for SHA-256 8038633891e3213e…

MALICIOUS

PDF

75.2 KB Created: 2021-09-04 13:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 774639795f5824d0885e93e6b17ae0c4 SHA-1: 14b63cca1e7c75de91b9f640beb7f752505dc364 SHA-256: 8038633891e3213e3f4fcfc47b24ce1332c7e9d5345fec573d62c7cc7974045f
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript stream and numerous links point to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, but the presence of JavaScript and external links strongly implies an attempt to redirect the user to malicious content or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://exclusivelimoservice.com/ckfinder/userfiles/files/24851150046.pdf In PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/86819492774.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/82157173726.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/31524592135.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/38c8e5da2bdee8fb4bd1bbf383ca38f5/kuzokinijevuwabozipuzixeb.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a90e504e547---minegedepopurotuzov.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4224d82ce---webivalonewuxov.pdfIn PDF document text
    • https://daismene.it/file/75429133982.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/laledanuzezotakujureneput.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/didebaweladade.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/jofekon.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/jfvs4mb2s3kf5foef0mstk98pb/kijavutowimebawur.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/49621976527.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210501033617027835nx0yhw.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/a1occs2qq41c7hqlcbl3d59ft3/dawapo.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/81312936205.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/teriwu.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/gunipapedumafivesa.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/42204370132.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/cc28f7b66ed4921ff032f12ffda7d564/6603372032.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/35691377879.pdfIn PDF document text
    • http://vejwun.cz/images/15067029074.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/asc609jsn7h1tn3uhhjt65esmu/pugibefagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=antonyms+and+synonyms+worksheet+4th+gradePDF 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_off0000c11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11A 10908 bytes
SHA-256: 524b1be301a32e14605cbb2238fb212f04868f769d2b8a5005b56630cd4d1b08
font_01_sfnt_off0000da28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23A 17432 bytes
SHA-256: 4a5f61cd6a622311cc9ef4d086f3cf12b10bd741e201b51ba2acede22da4d389

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