Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b6aa7cb9b195e6…

MALICIOUS

PDF

87.6 KB Created: 2021-07-08 07:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ade2486f874aa9af90e1e6e68d5c2942 SHA-1: 1f2da7a176c2253ed0b44fc741557126d67c44ab SHA-256: c0b6aa7cb9b195e6b2b1b2186ee10cd279aa061677e969c05dae0524765bb8c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to distribute further payloads or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/848e902df79798b11c04ae4a6cf3e364/webifovubatuloxomatix.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/7601577792.pdf
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/duvove.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3e37c769---76403482772.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083efdc9426b---64804441190.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/oabg20vn50s2om6tl02t2tnkoq/62109422517.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8a00c40cbeb9f5eb13bb683a2637857e/65558348639.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f4158bb7b---figefawavujigenemejuki.pdf
    • http://hzdsbg.com/uploadfile/1621342881.pdf
    • https://mides.vn/images/ckeditor/files/leposumoxuxilupasanomif.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afa452f387e---77978889481.pdf
    • http://spreewaldatelier.de/img/editor/file/mobudifi.pdf
    • http://mtsp.by/userfiles/files/nilekiwoxajinogofe.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/57d6c6830e3ee80b1c26b43bcec010ed/37962587378.pdf
    • http://alumcity.ru/userfiles/file/xebememogajepoxumum.pdf
    • http://laulumaja.fi/ckfinder/userfiles/files/zemaratefem.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5eac61dca---vofufijizujubidadede.pdf
    • https://bamor.org/userfiles/file/58322268234.pdf
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/jirogofexeladoxox.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8f4510716---nibukenugozatig.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160776c80b478d---33431788128.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/1ba0b21757e98fbe6436078a1d922588/bigad.pdf
    • http://dzstock.com/Upfiles/file/nasexu.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a55fcfea08b---nizonulatero.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b6a977aa98d525ca92181a56c3117175/67413383232.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607127e78eea8---sasiwuwesigokuwiri.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+are+quality+points+in+college
    • 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_off0000ef9b.bin
721b1f6fb9f87dacaf2450c2db29cb2f6834624bd948c79b29ae62d5c5f4942a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 11004 bytes
font_01_sfnt_off000108e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 16792 bytes
font_02_sfnt_off000120f3.bin
fc78be8e95bea466f8484a8a1bc7d153220bd1f6d4dedfdf9a6585352036aef9
pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 17892 bytes