Malicious PDF — malware analysis report

Static analysis result for SHA-256 0787a3e4a80083a5…

MALICIOUS

PDF

82.6 KB Created: 2021-07-03 12:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c520a15326dda198996c2feecc897bd1 SHA-1: 5e77cab5b64cd2f55b57dbddd73c473fb9e1736f SHA-256: 0787a3e4a80083a5ad7fddae566b8ac949963f96cb0683916ff72668df36bc82
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDFs hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URLs suggest a multi-stage attack where this PDF serves as a lure to further compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160758490945a2---31326378806.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732c572bc31---48496587603.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc63c9f5aa---15805031311.pdf
    • http://brandnewgoods.net/userfiles/file/zitexejovoriwuwu.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/65310742707.pdf
    • http://nineslash.com/user_file/file/rijidel.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ovvatrdu2hdpcc4946spvdpp2c/58066244599.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cd85af2b955178b4241eaa718729e95c/doguperaxejosun.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/959542cfbfeb8084914c10763df83cc9/jeruxupilejafaxuxus.pdf
    • https://mfdesign.hu/files/file/kevamoxipufu.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/88d16f98162ff03908769d2ee8b9746f/wufiwolutex.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/38rqdnnvdqa863bj4nal0jue23/favejud.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/b776ee89ae5595e59e295691e278f144/7562989386.pdf
    • http://ezibra.pl/upload//file/48133605279.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/a7nj02paq51v378smv01u5kmmm/vizaxituwovedodiwuzebumi.pdf
    • http://etasystem.net/userfiles/files/46593993796.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/2lerh07jvkqqh8q56jm4elkb17/73121591474.pdf
    • http://xaydungphongphu.com/uploads/files/wokitiwusosiwibapuzesinam.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/zedupu.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2909971c3---duromoduzi.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e7a3cd4fb---41658396186.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/8b8ac2dff30342eb937dd1167a9c89c2/losoweparuravej.pdf
    • http://kennycojewelry.com/userfiles/files/202106/1624097812.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdac2420076---76661849439.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a15d503a450---nimukineze.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=2017+business+leaving+cert+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_off0000dd91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD91 16792 bytes
font_01_sfnt_off0000f5a8.bin
3ce7c5271d8764d891cdba33ad9ab234f74b2fe8150a1daf5aa17827a14beba9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A8 10924 bytes
font_02_sfnt_off00010f4c.bin
fc89bd2b1987ff91a9b52dd89835e6b781ebbff33d8da539203b8611c541bc3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4C 17504 bytes