Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b47083109e2504…

MALICIOUS

PDF

96.1 KB Created: 2021-07-23 06:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25a31699be12b20ca6657df5bcb2fa33 SHA-1: 5fd32840f31dd982714dbc3aa5a937dbc732ec9e SHA-256: e1b47083109e25044ad9d296387b426cc7c928353121da22e198ebf2057eec0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns suggest it's designed to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6edb7b9b1c6cae572d03929f452cd309/mowuzatagusijosufufovalo.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608418b74d9cb---91256605054.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/fa01kpdtcdc6bgahpc028h2th2/gubufewekorabuxonab.pdf
    • http://technoculture.cz/admin/upload/file/nagogalim.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/af46591ebaefec797304b98ca13b0307/puzetazefur.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1kjhqdn0bh5s98ndnrmuacdmhn/pakukoren.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/4c8c24079f64e83c322a12757e511f76/23452291263.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-17/20210517225643719463.pdf
    • http://kalkulacka-hypo.cz/userfiles/files/23025245525.pdf
    • http://normel.org/files/upload/file/75504321412.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607074d86ed31---7151243735.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/irml5qhsf3us3batse7o9ov4o4/girax.pdf
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/gaveduwizutejutazudurumig.pdf
    • https://aksukartela.com/images_upload/files/9386595739.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701b4a0158d---58607407395.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c88562380f0---90250665998.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096042ee2de9---82549290347.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16075359962c90---56950895329.pdf
    • http://medicamarsala.it/userfiles/files/vurefibogepisewomobal.pdf
    • https://abugfreemind.com/userfiles/file/80805151497.pdf
    • http://humanlitech.com/files/files/mivofewagemukifofa.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6d267eb6---kujokupesus.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=english+hate+quotes
    • 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_off000116d5.bin
10997185042560b8b1111cc377571b127d0a52226d398d67ac89ddfb7bf6f9d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D5 10516 bytes
font_01_sfnt_off00012e61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E61 16792 bytes
font_02_sfnt_off00014673.bin
e0294d39d47ae90be26f3c6d2f656fdeef4e4dd7770741f26a12395c54ad06ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x14673 17316 bytes