Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0496812acb8f70f…

MALICIOUS

PDF

73.6 KB Created: 2021-07-17 01:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 627af7247a852c36d904901c0e92f88a SHA-1: dd06d4d1ae300d37681bb51d6000d2acb91a3c7c SHA-256: e0496812acb8f70f0de8715b1f5df7bb006c038b3eaaff8390c2b5e0fd59209d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to phishing or malware distribution sites, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e983493c89---57532589208.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee2d520c9e---47415392958.pdf
    • http://dilimkebab.com/userfiles/file/makojigilitano.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d055c7fbae---5531864507.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b1260ae55---33433311570.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ba9c5078d---nanazogizodozokuxebuwuba.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609aac47ae010---63357092543.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/kjkfg3c4bn50csflvu5khfacd3/joramazikonibuvinu.pdf
    • https://www.cascatai.com.br/ckfinder/userfiles/files/37954619000.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/75add3514ebb0db14ae09971e2965afb/rojadevigelibara.pdf
    • https://appfacile.it/file/73072799635.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/jnpqferiu3dkleom714ugm52em/12362341267.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/eabf2ee52b7b91dd30eb104cf4d96b9a/forepeverukedes.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077044e0e26e---getupaxolimu.pdf
    • http://alfavit.tv/userfiles/file/5013233030.pdf
    • http://beastyenergy.com/userfiles/file/fanosegoguzutewagido.pdf
    • https://virtualpulse.eu/UserFiles/file/46364661360.pdf
    • http://younewstoday.com/task/userimages/file/96167229168.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/famobajebusiweg.pdf
    • http://khanaphatgroup.com/UserFiles/file/taxurirofelinogowefafam.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a4456e427e9---raxumu.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/4d89a84327bdc220273cb10e364ff96a/29968735815.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/b019ubmrvaf3gohv2ekcf1vk7i/42434309765.pdf
    • http://haniltm.kr/upfiles/editor/files/23204175579.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=principles+of+risk+management+and+insurance+10th+edition+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_off0000bb7e.bin
475524f34eaaf8eb99c39c2a8fa9ef5483d0f4d7f16aa639edb8bc1be4ab9340
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7E 11432 bytes
font_01_sfnt_off0000d61c.bin
c943ad3e68d9642f7e68dd860092e12f503d73b9fd60f9f369bee7458c562968
pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 15724 bytes
font_02_sfnt_off0000fe9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9B 16792 bytes