Malicious PDF — malware analysis report

Static analysis result for SHA-256 b575de228dfd48c8…

MALICIOUS

PDF

79.6 KB Created: 2021-07-02 16:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de653fe2f115cc036c9dc2d61e9656e5 SHA-1: ddd7f9de0038c33a1b514cf1a33e7b48b37bd0db SHA-256: b575de228dfd48c802c3a38a3c1751fb997ee46f440c8b6a2bc47175e4afdacd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ee5c87e49e2f5795dc8637876c7ec3e0/16710740310.pdf
    • https://led7.ru/file/48739671315.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86ea670bb---46204427256.pdf
    • http://dzbnf.com/upload/file///75899021847.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/lulomulunu.pdf
    • https://iword.de/userfiles/file/3954943585.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094bc352d37f---tipuvatadebomiga.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/ad68e6c0c77976907dcfa3a9e95df1d3/kutiseler.pdf
    • https://corghialberti.it/file/43602989215.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/maqnm61g5a4th33o198p731lk2/13736933361.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae69dbe6596---nigadajumizagulireba.pdf
    • http://xn--42c1dhzaq5aeb.com/userfiles/files/panujunesopoxemanuxagera.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab403eaead3---92753392460.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/7bb120rrcvg26kkuhcho8o7832/goxutekitonegafog.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/064c60bee221b237d90a951f547bbbb7/59703507939.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab97a1313---86919046466.pdf
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/38595713963.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085995a9b005---xabuduzi.pdf
    • https://semagro-msw.ru/pics/images/file/41739032597.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/10bi0of5i57mt1hmto6d6qrlr6/sewexores.pdf
    • http://rauvuonsach.net/images/uploads/files/nukutukedezuzemiz.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5940c0da0---31489365389.pdf
    • http://www.predia.cz/userfiles/file/mogitufise.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cell+vocabulary+worksheet+pdf
    • 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_off0000d1b4.bin
dbf6c37e2838a84a3b2c58d8efd3e6117d407db3c54e7d7ae0f64b005c0b7cf6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B4 11148 bytes
font_01_sfnt_off0000ebda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 16792 bytes
font_02_sfnt_off000103ec.bin
086f1832bf2377eb8197a0a7321a3810490a54a8b471c1f7ba88348bfdbb35c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 17284 bytes