Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0c3d678d973445…

MALICIOUS

PDF

82.2 KB Created: 2021-07-08 03:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bd1f1ed61d92f2f634cde674b2c03e9 SHA-1: e477796a554ae0eb2656e4b8de6e71dc7b36bb68 SHA-256: de0c3d678d973445a6c641e84260bf9048ab1e0a475f65c8f1f6483da8b32dcc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also features a link farm pointing to multiple external URLs, many of which are hosted on compromised or disposable domains, suggesting an attempt to distribute phishing content or malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/92f276143883efb59e10386455ea276c/pumejidozobokidegozuze.pdf
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/zuzozeruxexumexopigububil.pdf
    • https://valenciamaids.com/userfiles/files/xipopadititagononiwijar.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7e0a510a8---xenogumexasejaga.pdf
    • https://ketdoanbus.com/webroot/img/files/20992728246.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6484a5177---tafoxenalag.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/c740ffd4ba7ef466b983b6a2377855a0/67935366986.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/32f527cb725027aacfc0b90f12f2abb0/moritekinaf.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/8ikirnl53ds88bbrqng0ek5r8a/movezuwozuwozu.pdf
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/e6315635e10dd757050cb6f234d51241/24125594369.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b878f331cf4---fezasuvujikunomaz.pdf
    • http://magnachip.cn/userfiles/file/20210508060841.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/74d9101aa34eabe7a4c8476657194ac5/dajigiginilaperafewaxuze.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0a82a232---gukukufulupokav.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b76dea828a6---lafepisuvag.pdf
    • https://songhong.info/userfiles/file/tepex.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/0c4ae604bacb4d4c9f1e6854bbc16d60/rudabewavose.pdf
    • http://provia-events.de/pics/fotos/1/file/rarumipo.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c9ae4439fd9e007aa387984212d9baf/vuweta.pdf
    • https://anmoul.com/userfiles/file/63809796601.pdf
    • http://fedoro.ru/upload/file/79374705602.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc35366462---80689592872.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/a3jq0supgeae0fmtopl1phkv30/famovunowexajitide.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c7137ec84---vebaliketidutedu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=math+in+focus+course+3a+answers
    • 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_off0000dc35.bin
5b6f568ebee5a17c92a9203e6b7cf21136fd918c4dd94b6247c339b625f54e00
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 17708 bytes
font_01_sfnt_off00010aaf.bin
0121fcde80a2e44ee4e76343952d7a04c07156c0683e793f525c326d88eb5c3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 10736 bytes
font_02_sfnt_off00012377.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12377 16792 bytes