Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba48010a53e75b3…

MALICIOUS

PDF

79.8 KB Created: 2021-07-08 02:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01016e5766d8a411fed15dfa1eb4afc3 SHA-1: 86a144c8130dc996e9e7a1669c5a070bcca899c5 SHA-256: bba48010a53e75b33fa841931522e55b8ec65dac0497b616b69023a3036f8aea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites or disposable hosting. The presence of embedded JavaScript and a high ML classifier score, combined with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests malicious intent. The primary goal appears to be redirecting users through these links, likely to phishing pages or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210619030311618851inmsbv.pdf
    • http://liyangah.com/Upload/file/bugipa.pdf
    • http://broadmoor80.com/clients/866172/File/bekegosezaxevulotanujojo.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/770f6c8dab5e28f62c79a13a1673c487/65327684703.pdf
    • https://actorconseil.com/files/file/wenurudetu.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/cfb67df35b1167dac3686d968c041102/80706180584.pdf
    • https://ph2020.org/FCKeditor/file/dapasefadapaxefutam.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/16652057578.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f49dab1184---7207259098.pdf
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/47092443086.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/qjmf0334kjr5r4qgibroiagn92/72821373924.pdf
    • http://blbr365.com/userfiles/file/1624369585.pdf
    • http://aerotechgroup.ru/img/outer/files/xoxabavonitokapun.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0e42c98c25d479e9373ca3e5163ccdd9/95874390374.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/56c28c3fbf71c8beafbcbd5518ec645b/mogosowuro.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/9d97097447f32d2ca7297a1d1663dffd/dujokutifebukozogit.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af7b6e09ee---fadivibasuvuw.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/v8sioeju37opmo0rlj2bdl0a59/36917194634.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/418fc6f6d803c29d513735c44a8b042e/41992153370.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ufos51gaja604brih55gir9rfo/10548143588.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/1eabab99ea3acdfbac0ca8201c721df9/retobujegeleniturimugota.pdf
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/76fc8320bb541cc755e69e40c225d778/vufuwakimofikerubamimeto.pdf
    • http://esipro.lu/userfiles/file/36429913590.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/00m160fr0kfhbplagm26m5n5c7/wukolakazeje.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=powers+of+products+and+quotients+worksheet
    • 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_off0000d547.bin
a667901e1bc0f429351146b0c4f033de9a9dbe4dac7cd0e9bc6772d951af0d44
pdf-font-stream PDF embedded font (sfnt) at offset 0xD547 16496 bytes
font_01_sfnt_off0000fff9.bin
3af30c17f7e32afb9bb53e36f5ba91ecfa288aa89dd0fa08a861104bf04c9cd0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 11096 bytes
font_02_sfnt_off000119ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119AD 16792 bytes