Malicious PDF — malware analysis report

Static analysis result for SHA-256 7661619767464d07…

MALICIOUS

PDF

85.2 KB Created: 2021-07-03 07:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc1cf13d204c23476f5f7c71adbc54e5 SHA-1: fb4e150921e0824216de9c2cc12f23eaaeafe03c SHA-256: 7661619767464d075a8586facbcea7eadde5aa712486f543a0020abbcf3ab625
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://kopari.hu/files/file/9672549867.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5052c587---20490403224.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/kaegqhdn6h1tqlke2mnn5btnoe/51195640041.pdf
    • http://jiuxingchaoshi.com/uploads/file/270056235933.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73128552a---gigexegul.pdf
    • https://strechybenesov.cz/content/69690037446.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085fed111576---31983413808.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875f24ece72---xotuxuvetixetidezezi.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f404268369e88c3b7d8c913c1208c36e/kupiwademosebazom.pdf
    • https://aonetreks.com/uploads/file/742048402.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/c0cea71a0bd5dab31f4b09eb8de93c54/54532662080.pdf
    • http://xahscw.com/userfiles/file/15836520065.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e342014ff6d30fdb9fd71513842e2743/2808233433.pdf
    • http://mazdooradda.com/userfiles/file/24165316353.pdf
    • http://myjobcareer.net/userfiles/file/2021052200332973499.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/vigano.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d155831d07---62261420327.pdf
    • http://bet-balance.com/userfiles/file/69796400538.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607207735c851---jemogufesi.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa53471c5a1---14573585637.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4843a0c593---73686487525.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-7-2/20210702071557399020.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a737c99b488---98504953112.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/sigomimuzukikakoxalo.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/16df55b8240a0cb573e24871aa5e2ec3/dofewerikukina.pdf
    • https://jeneifogaszat.hu/cikkdata/files/78284717971.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=emotional+barriers+to+communication+in+health+and+social+care
    • 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_off0000ea1a.bin
d465a604538c88fc3db4792535f0738a01dba3212c7d0878eea49a90e5a02fc5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1A 10860 bytes
font_01_sfnt_off000102ea.bin
3bfee4fa872174669c78de65d8f44297ce2b8cee77ccfb95c5dadf47c21d29ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x102EA 16944 bytes
font_02_sfnt_off00012eff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFF 16792 bytes