Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a4eba48ee0a113…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 20:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 752207c692d185d3d37e05a0d6132124 SHA-1: 8f7e1d9a05e8735304ca8265f71954a6b9cf4009 SHA-256: 87a4eba48ee0a1135775249b80388dff1aee131f51d8c307862fe198b4c72732
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a malicious intent to redirect users to external sites. The embedded JavaScript likely facilitates this redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://jjcfurnituremaker.com/userfiles/files/kapixiribubesoxagim.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0012fde8974ac480f67e281823ce1e98/zefazavoburitebadididod.pdf
    • http://primethailand.com/ckfinder/userfiles/files/66007720932.pdf
    • https://etcbt.com/userfiles/file/2001748035.pdf
    • https://apotekatia.ba/fajlovi/70752307678.pdf
    • https://italvaping.com/file/zuvitepaxekewu.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/58121493305.pdf
    • https://wheelmartthailand.com/image/upload/File/gorabezoludofemunowe.pdf
    • http://ersenergy.com/UserFiles/file/18297069803.pdf
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/dawesesivif.pdf
    • https://showdetango.com/bafa/userfiles/file/9699559116.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/gukudonaka.pdf
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/tikexutadaloxogijisameru.pdf
    • http://hyunbulsa.org/~ewedd2/userfiles/file/duneg.pdf
    • https://pediatricpotentialsnj.com/PP/PPpng/files/33507831881.pdf
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10376055054.pdf
    • http://daiichihr.com/uploads/news_file/gopizirurajitebaz.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161490728d5062---linufo.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/f5cea7a6fbf7e5155e64c0281df81881/79869407060.pdf
    • http://merwepizza.com/upload/file/bulil.pdf
    • http://www.jacenter.org/js/ckfinder/userfiles/files/pozusalutow.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d4344372c4e27145752c2786133045b0/ninenepanawuxo.pdf
    • http://trungnguyenjsc.vn/uploads/image/files/61454371325.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=putlocker+new+site
    • 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_off0000b149.bin
e781ce98c918f29a4fe41e58c8f6bee8c445d079397c75e8bef8c6940330f7d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB149 15736 bytes
font_01_sfnt_off0000d985.bin
a38069ac11bc609434a2e828f3d88bf82a3448eceb24e06b7f029cfe4a7c152a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD985 10340 bytes
font_02_sfnt_off0000f117.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF117 16792 bytes