PDF malware analysis — malicious · 081f1644964560bf

MALICIOUS

PDF

81.9 KB Created: 2021-08-28 16:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: d9527973662e021bd3ed289a658c0433 SHA-1: a0c246f4a0cd6fa175598a03d2a6dc575b217c46 SHA-256: 081f1644964560bf308fc54fdf105d2927888a5ba3de9c3c1bf818e481038465

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous embedded URLs, many hosted on potentially compromised WordPress sites, supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9932

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://alianzablue.com/aym_image/files/rezijipikupisadew.pdf In PDF document text
- http://sosonomo.com/ckfinder/userfiles/files/11278584912.pdfIn PDF document text
- https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/461873b574ca68341abeb7c557f969e6/widipapukamura.pdfIn PDF document text
- http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/surubasotujarokabatijoz.pdfIn PDF document text
- http://szakkepzosiklos.hu/upload/file/xukixuzel.pdfIn PDF document text
- http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/po6lfqi2o4vabjqvmcdnbqtefk/74701828413.pdfIn PDF document text
- http://benhvienlaptop.biz/userfiles/file/56660317576.pdfIn PDF document text
- http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/51443938343.pdfIn PDF document text
- https://menokatea.com/ckfinder/userfiles/files/ripegunorexif.pdfIn PDF document text
- https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/94a8fdf723fc6c7c35de1733e1811eb5/3833772673.pdfIn PDF document text
- http://yishiweb.com/upfiles/files/20210811_134305.pdfIn PDF document text
- http://magogaralbamoble.com/galeria/files/wowegibukujumofigaxofeg.pdfIn PDF document text
- https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/dokinewolukatozix.pdfIn PDF document text
- http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/54139100458.pdfIn PDF document text
- https://pemaboutiquehotel.com/assets/userfiles/files/46533531200.pdfIn PDF document text
- http://sarlampa.ru/upload_picture/nowuli.pdfIn PDF document text
- https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b9d18a9ef---32846242864.pdfIn PDF document text
- http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/khtqmipe98ekkq2giicpkj76b1/95945933032.pdfIn PDF document text
- https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb79ed8d6---libegulikod.pdfIn PDF document text
- https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f7fcf880b99---bixudagabiz.pdfIn PDF document text
- https://irepairplus.nl/app/webroot/files/userfiles/files/29221387696.pdfIn PDF document text
- http://ildungrice.com/fileupload/fckeditor/file/74864549700.pdfIn PDF document text
- http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161272695dd1c6---befowapaxutiwutepupibike.pdfIn PDF document text
- http://thaiboxes.com/piceditor/file/jufasogu.pdfIn PDF document text
- http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/wokegazuva.pdfIn PDF document text
- https://mgogs.com/mgfiles/file/54014314333.pdfIn PDF document text
- http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61676618754.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=transition+of+electrons+between+energy+levelsPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d9e6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9E6	17408 bytes
SHA-256: `36d6d2908667ff7c779fec02b021b096b541c8d3ae6805a23ecf6839774257bb`
`font_01_sfnt_off000106ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106ED	10880 bytes
SHA-256: `36295b9fc210ac5e2b229729720e41c83e1cd26736c74b575d646a29c7190443`
`font_02_sfnt_off00012057.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12057	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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