Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba86823611a9b3d…

MALICIOUS

PDF

75.5 KB Created: 2021-07-06 03:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0812257554f68b106c3ee78d02bf9924 SHA-1: a79d540ed4b3711791ddc733b3b900650c9a2400 SHA-256: dba86823611a9b3d607326bc02860b0d05180bcb01db6ac6a62a10d7bc8d2932
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://synerhu.ru/uplcv?utm_term=bioman+enzymatic+game+worksheet+answers
    • http://everest-c.ru/ckfinder/userfiles/files/10137687080.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607714b8f0abe---tupusuruz.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ef10fcb242c7b80a17331fa216ffe7b/74656123950.pdf
    • http://goref.ru/files/file/vavowokukilo.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607792e7068c3---bawaveruraj.pdf
    • https://area5srl.it/file/bupuwunutatuvarizoneg.pdf
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/fatamikax.pdf
    • http://qlinairnv.be/userfiles/file/93792023416.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0a7ce3a95---gawiwonuvaxixoteno.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf1f9d776d---83458911854.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9b7215d8c---buvijogegulebaxal.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cc6a7a96f---59359889397.pdf
    • http://thermcom.cz/userfiles/file/10712202945.pdf
    • http://businessvaluationapp.com//fck_files/file/5048774090.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcfc40ab95---jixozixoxirimojaroji.pdf
    • http://www.cafeinca.com/img/public/contenido/file/dekusoxabiwe.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096eed61fe07---32038420988.pdf
    • http://suvagcentr.ru/userfiles/files/18879291954.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/eb16a9502c6f98564ae2c3674b37a37a/62936737630.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc40fa00cc---6298558581.pdf
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/86296300081.pdf
    • http://asja-doll.ru/userfiles/file/sapewilikenakabuxopifej.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/5288cb9b42d2fe44a64b78bae9c12251/pewoxixevolitiro.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160a851e95fb3c---fojojebejuxen.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_off0000c035.bin
b37e0bc5cc8181faf42faf23b0d4146728f053d5e8d1fbdecc6693024c988636
pdf-font-stream PDF embedded font (sfnt) at offset 0xC035 11036 bytes
font_01_sfnt_off0000d9e0.bin
153b0e5032a0aed96f1fb24b593d35b8a6f7c9fb46aa5dc339de7a2c49913b42
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 17064 bytes
font_02_sfnt_off000106b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 16792 bytes