Malicious PDF — malware analysis report

Static analysis result for SHA-256 15cf7eeadfd319a0…

MALICIOUS

PDF

69.5 KB Created: 2021-09-19 02:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cbedfda0ab8fd0e8402765a0ba30601 SHA-1: e1d2734837efedf483986d572e9034549d69ca79 SHA-256: 15cf7eeadfd319a0516c7596717de13eadf45f15b5acc288999a2dce5e9194b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, identified by heuristics as a link farm on disposable hosting. ClamAV and ML classifiers strongly indicate malicious intent, specifically a phishing trojan. The embedded URLs suggest the primary goal is to redirect the user to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7ae3c6025---mekuxopujogutavivaf.pdf
    • http://kingswaytyres.com/project/kingsway/uploads/file/funijogaxusudoris.pdf
    • http://healingtown.org/userData/board/file/66328667603.pdf
    • http://gomientrung.vn/uploads/image/files/73985350504.pdf
    • http://villabrown.it/userfiles/files/19183257867.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/fm8ij9tucqa2vfnv1sua3quef0/34415029738.pdf
    • http://zsdbiopharm.com/upload/files/86652404629.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139973e5745c---jagefuwufev.pdf
    • http://cathugo-yachts.de/res/wysiwyg/file/48365026644.pdf
    • https://illustrations.noche.fr/images/files/93918620896.pdf
    • http://ijfbn.com/editor_up/pufewasovorejaxet.pdf
    • https://channeloflove.com/ckfinder/userfiles/files/97452504896.pdf
    • http://swiftnb.com/ckfinder/userfiles/files/56646041986.pdf
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/79211965622.pdf
    • https://tonwen.org/userfiles/file/67632777298.pdf
    • https://auto826.com/uploads/files/gijogusigeratasisesuru.pdf
    • http://malir-naterac.info/UserFiles/File/ditapagenuketaxuzog.pdf
    • http://airelimpio.mx/img/editor/file/kukogapoxubokege.pdf
    • https://sma-dfgg.org/site/admin/file/gejizugepabejavi.pdf
    • http://shepardinteriordesign.com/rw/upload/file/92096804740.pdf
    • https://stallion-international.com/userfiles/file/27496610735.pdf
    • http://cancunday.com/travela/img/files/62946848588.pdf
    • http://seosanhrd.com/userfiles/file/ralisameraxijelesixe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+app+to+make+android+look+like+iphone
    • 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_off0000b1aa.bin
2735020e3990a4e84d7733b764ce5c5c2224f1f15e2ab4172623164d4ee010c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AA 15012 bytes
font_01_sfnt_off0000d742.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD742 16792 bytes
font_02_sfnt_off0000ef59.bin
ed9e2db99d13c83949c04e9a9313613501e004f26677c5e095e332199c3cc74c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 10800 bytes