Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0342f21261b1c9…

MALICIOUS

PDF

88.5 KB Created: 2021-06-28 08:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2118b7581932b772e69167ccacc55798 SHA-1: dcebaf8d523d716e923ef8a0e84ba12b09ed280c SHA-256: dc0342f21261b1c945fc2962d07cdaacd4a432bca96ada2b21cdda0cbf5c6c38
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30a6571cfb---xerizux.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbc84ec329---92536161366.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/qq2p75r7ien4kso3bqvmrc4t06/18220725781.pdf
    • http://canxetaidientu.com/images/file/43381757614.pdf
    • https://newtech-utm.pl/userfiles/file/makupepe.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/afc6eca4ccffb13d749ec2b47e6460ae/tinozumexurelavi.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/88681449760.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/a194d6cfd92fdb2ae4354f47bc83bda0/jibaniz.pdf
    • http://kotolantopeni.cz/file/39869447983.pdf
    • http://csc010.com/userfiles/file/20210618145141_hkl8rv.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdf0b3b599---funolojeninubimesosu.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/leuvfhjaho2kv5ldrpi43v0v44/62141866069.pdf
    • http://s-privod.ru/userfiles/file/mixujuxakarajag.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160929f2bd4eb1---25231867979.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dee78eb23e---52891296057.pdf
    • http://tubietelbar.hu/uploadfile/74535655958.pdf
    • http://salsainkonstanz.de/media/files/64107336858.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/p5iq8bbdccjsrf8hvk43psg4ul/tavakuvepogagotetozameto.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/f8175ffe5feebcf8507076e46e5b96bc/xumolanubimonubemijaka.pdf
    • https://artenika.pl/fck/file/dalugakabesogalebazi.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/f29b3775d89e89dcd396e2b2383792b4/nomulitetozaza.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c30381ca79---25303642379.pdf
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/42183444404.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=witcher+3+land+of+a+thousand+fables+loot
    • 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_off0000f4d3.bin
b549de8fb6686b496f269ba27abe97a84ee600bcc67cca2ebbe55c759668c691
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 10976 bytes
font_01_sfnt_off00010e4e.bin
2f5449226dd1cfa2f9ac07b0e9a47c0a3f9600699dc8586018f67c770ebe5b34
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4E 17684 bytes
font_02_sfnt_off00013c87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C87 16792 bytes