Malicious PDF — malware analysis report

Static analysis result for SHA-256 662cf4819c410277…

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 22:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dde89108416a09fa4e38e4860ca552ca SHA-1: 87dd748ff3689ecfaf7a77d73b4ea35e9517b44b SHA-256: 662cf4819c410277827fe643c364bed36c32c4e28749a54670fe5d2c7a1f8225
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The document body is unreadable, but the presence of numerous links to potentially malicious content suggests an intent to redirect users to harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9607

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://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67bf8903de---fexumepifajumazasijawu.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c675c82d3f1---zuromafiwifide.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160814a2595454---megutegup.pdf
    • http://baigeleather.com/userfiles/file/dotesezuj.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608aac7328cd3---64277696366.pdf
    • http://myphamlulanjina.com/upload/files/87320453907.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16076539bd30e4---99309136602.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/6945620c234177939910494294c337d6/waxedizupadotaveza.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1399f106ea7dea9e740085cc1b88e70b/52049980651.pdf
    • https://imagebeaute.fr/userfiles/file/50577562525.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a768d7263---25676698157.pdf
    • http://meyanko.com/userfiles/file///pazeferebeboxepelafira.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607cff9b09896---70432925341.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16077283d9e623---27653353819.pdf
    • http://canxetaidientu.com/images/file/56477774186.pdf
    • https://nutricount.cz/UserFiles/File/15103329320.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ce3d36b10---6991197707.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/v4pl363f90a8ibsm1nnvh371d6/27327508861.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ea9589c2ec6dd4a0ce4d2c91228bea05/gazipisi.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/9qcu8t28veka5abp46828o61a5/deremim.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ve2q5c8v0l8pm02u4sckt9qua2/pudidusirugabizozof.pdf
    • http://abwingsva.com/uploads/files/70698911230.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/9e84041cab1ffb14e69035ef8a029ba2/73223629518.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16072eed2ba698---lixal.pdf
    • https://ludifrance.fr/userfiles/file/junagaturufafezovaxajeri.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/glsua9j9ptikseolkfqu9gvflb/18381342977.pdf
    • http://ilovegabal.net/fckeditor/_upload/file/30673728211.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=intimation+meaning+in+bengali
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c40b.bin
3ea765c351aca154e25299dd7042a2d942c2d15afe667a2a311f8adf1a5183c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC40B 20244 bytes
font_01_sfnt_off0000f73a.bin
53c430df115e8a34ceb9ab73505c810aca2310422902256655c0b356bf3e80a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 10272 bytes
font_02_sfnt_off00010e43.bin
fe5c24e4e53a017e0f1af12ffea50d546deec028dd4e4471eb247c60f1566edf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E43 16484 bytes
font_03_sfnt_off0001254b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1254B 16792 bytes
font_04_sfnt_off00013d58.bin
819b75be935019d5075e453a677bebbfacfb6c37cb222903f2fca360a942d1c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D58 2340 bytes

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