Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d45e960a29f43fb…

MALICIOUS

PDF

86.4 KB Created: 2021-06-25 17:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe801f0723cc2e0f54bc72d82d64d5fb SHA-1: 6543703d1a77b0d9bd75f7147275841375e07071 SHA-256: 3d45e960a29f43fb07e1a371ffba3f98614dead9fba10c0795c022ec3a5f25e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's likely part of a phishing campaign or a downloader for a second-stage payload.

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://nomylo.ru/uplcv?utm_term=night+time+would+find+me+in+rosa%27s+cantina+lyrics
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f073c9902a---muximanigijulafulevexigev.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0a4f56fa0---mezudutasiwufa.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/16143146200.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/d40c9g8u10vio60ftvfjjtdscr/tefazaponikebivasap.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/oaq4pg6tetf7hj0thfctgec81l/31934265140.pdf
    • http://a-swiss.com/upload/userfiles/file/8408512843.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/60801498877.pdf
    • http://4bx.pl/public/file/96544243155.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/2dh97jigg76nohgh7b63khuno5/tibuneluxutaw.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec54d67d5a---27680048199.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd5af12975---59448354002.pdf
    • http://kalikraft.com/images/file/436242901.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160702cb192835---58222871069.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/0vhtmop1luqfgtuakv0b7urjca/fexuwuf.pdf
    • http://korean-school.hu/hangul/userfiles/file/gimaligewilofiparajadesuv.pdf
    • http://recrute.fr/files/files/35464697284.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/f0u6n32a67ckrccnmec6khp562/268235811.pdf
    • https://raiporjai.com/piceditor/file/lebuwezul.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/a6pmriqc6tm96s9evc6n8a2981/22210002314.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/e393022ccfc6sfbi0rc4dngcgi/6514451195.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7568e47c1c---tafizovevujebazizore.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/bnroplfuhg9bqsgbqcl8tngvr2/22586501890.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/nemes.pdf
    • 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_off0000ed1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 16792 bytes
font_01_sfnt_off0001052f.bin
a7ac8100d57829469c81a31474b3904cb3384856c3951cc4f18bfc9fd8c95417
pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 16940 bytes
font_02_sfnt_off000131d8.bin
791cf1a1b373887a2bcc60df79b7a0935bddf363e626df3e9a4f2d2c9b98e521
pdf-font-stream PDF embedded font (sfnt) at offset 0x131D8 11236 bytes