Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e49b8e08678779c…

MALICIOUS

PDF

73.3 KB Created: 2021-09-08 23:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f25cef99fb67a622eb10994c1b67ced5 SHA-1: 3aa7b74450df8c225e98ae72d8a21b6fb57cb1c4 SHA-256: 5e49b8e08678779c7be8b84513e4069a05aae76098611b2060489c75f894a968
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to multiple disposable domains and compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. While no executable scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nedimgame.com/calisma2/files/uploads/mosetuxuk.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8a32c445f596c930d7c89e444f742f33/74270754612.pdf
    • https://dlt-nkp.com/fileupload/file/pulejinigemen.pdf
    • http://kashima.cc/userfiles/file/vasijinadexibikorurozanis.pdf
    • http://ortopediaszombathely.hu/editor_up/72373375993.pdf
    • http://budaikepkeret.hu/uploads/file/xunatigekatas.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/723c9f3e708d8e8f1d5a8d4478a69cc3/27017716697.pdf
    • http://ippon.lv/uploads/File/nisefikoza.pdf
    • http://viorina-deko.com/images/file/51208941548.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613719f9bf950---govitelanivulobemakoful.pdf
    • https://lawyerupsmart.com/tempimg/file/77247014243.pdf
    • https://hsse.hssanesteban.cl/files/nadojupuvofozij.pdf
    • http://delve-cr.com/uploads/gubodoxebijutipewibixakim.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/38486218918.pdf
    • http://www.pethouse.es/ckfinder/userfiles/files/11656084438.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee4aecdaec---mogewuramikut.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f724a86641---wedejejiruzozobovomib.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mumidorewokiwag.pdf
    • https://wineuniverse.us/userfiles/file/53483161849.pdf
    • http://wajl.net/img/file/202198115658.pdf
    • http://jinwoosmc.com/userfiles/file/53760151846.pdf
    • https://jhservice.net/imagenes/galeria/files/vaxaxitogazokebama.pdf
    • https://themalc.org/files/file/sanobosotinojajiwadek.pdf
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/birafezepewilide.pdf
    • http://cathugo-catamarans.de/res/wysiwyg/file/gibatojovapagejuziw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=d+major+acoustic+guitar
    • 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_off0000bd60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD60 16792 bytes
font_01_sfnt_off0000d577.bin
f68d2f3bc3812f314f4659a37ede8a9fab7e5973def3c128c88fa24742855bc0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD577 10524 bytes
font_02_sfnt_off0000ed6e.bin
20b3893b488de945bf377c47a68b1a3e040e72d93b14aa7954a4cf5fda83935b
pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 16512 bytes