Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4242325a460ecf…

MALICIOUS

PDF

87.6 KB Created: 2021-08-10 14:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 178a68cc0f1851942144fa03cab024dd SHA-1: 938ecbd8ec1b4a2d134bf13cf058f0e2170077fc SHA-256: 7e4242325a460ecf2de4aac489f164fdb5f3e977290becc0d9a6de062f16f044
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload directories, forming a link farm. The presence of embedded JavaScript and a high ML classifier score indicate malicious intent. The primary function appears to be redirecting users through a series of links, likely to a phishing page or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30328985798.pdf
    • http://aceonlinementors.com/userfiles/file/19750066336.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bf35d4516---zetitatoxewufonopofesexet.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/c8f812ad7a92a2599b765a87b2d29d06/munovol.pdf
    • http://pnmanagementsolutions.in/uploads/37073202769.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c715dbdf7ceda1f4843b23856a77409d/87374132743.pdf
    • http://ameshamagazine.com/js/upload/files/binefenuseremem.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/due30hd1kl3v3h7pcnprm46eag/40720026357.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-6-27/20210627132810168997.pdf
    • https://fajndoktor.cz/images/file/files/roxosilupudijet.pdf
    • https://pezenasenchantee.fr/userfiles/file/gemof.pdf
    • http://romanakladatelstvi.cz/userfiles/file/vosutadek.pdf
    • http://hani-bee.com/userfiles/files/41098811231.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf88fd61421---58113050101.pdf
    • http://www.gabrielamaciel.net/images/content/file/rapenoveranaxojimarebe.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb7cc9e8e---pupiwibedexupi.pdf
    • http://cmuniontravel.com/userfiles/file/gizufokenuri.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a77e255238e---236292934.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/19273398354.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e0e8d5f580174a4381f8f43f08e35f49/sazimojosabuwudopaxanijig.pdf
    • http://planetamama.ru/files/file/sikavelabepapipiwixofaram.pdf
    • http://piemonteforyou.it/userfiles/file/97439604622.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=resucito+cantos+del+camino+neocatecumenal+pdf+2018
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b92ea2115704849e09a557a1da880611/bukaretobik.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_off0000eff6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 16792 bytes
font_01_sfnt_off0001080d.bin
d5b8af17d3e50adbdb73e17994298cd868e52281878e82d38af39759913dd24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 11328 bytes
font_02_sfnt_off000122c2.bin
f6f2b35f8754d819e5acf8758cc0d53818382bc42b3dc16ef94e9400baae85b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x122C2 17492 bytes