PDF malware analysis — malicious · 61acf735e0b6bdd1

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 05:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 619b56a0607d19ca467cb4d6c65e77c3 SHA-1: ba3c91133451a5528e03b6d42f9d0138bd8a7a45 SHA-256: 61acf735e0b6bdd13b13f99db8bf2930c25b7e144736b50e77e81fa5fe1f7773

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead users to phishing sites or download further malicious content. No scripts were extracted from this sample.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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=budismo+libros+pdf+gratis PDF link annotation
- http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c939b02a5---funabazesavomaxe.pdfIn PDF document text
- https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/0ec1fd80ceae805a683036f271d0f507/xifopi.pdfIn PDF document text
- http://aliotoconsulting.com/clients/862286/File/pirunufopo.pdfIn PDF document text
- http://pillshop.ru/uimg/files/66388459899.pdfIn PDF document text
- http://kimwendelldesign.com/ckfinder/userfiles/files/81876311756.pdfIn PDF document text
- http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/roleruwug.pdfIn PDF document text
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d94092578d3---8763920113.pdfIn PDF document text
- https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/61986351950.pdfIn PDF document text
- http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076ec0f830ef---xubusomezalomojos.pdfIn PDF document text
- http://inistor.com/ufiles/files/jowewovovaripadil.pdfIn PDF document text
- http://kayamedbursa.com/userfiles/file/3132971139.pdfIn PDF document text
- http://xiangzhuan.tw/upload/files/18616337287.pdfIn PDF document text
- https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/37d958c796bad88c1be5d7a5af9daa45/83858900406.pdfIn PDF document text
- https://sardavetri.it/userfiles/file/kipodibilinovoneno.pdfIn PDF document text
- http://thanuyentea.com/ckfinder/userfiles/files/kulazisovafepoji.pdfIn PDF document text
- https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/30b073432e5658569b5ac41fa579f976/3830035766.pdfIn PDF document text
- https://cochleartudaskozpont.hu/files/29774056974.pdfIn PDF document text
- http://centronegozi.com/public/10794783478.pdfIn PDF document text
- http://tweddlefoto.com/files_contenidos/upload/files/11355721727.pdfIn PDF document text
- http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610b66a5c80c9---15759820886.pdfIn PDF document text
- http://electriccityusa.com/images/fck_uploads/file/83993082676.pdfIn PDF document text
- http://chongthamnguoc.vn/img/files/kexanabojenewa.pdfIn PDF document text
- https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/6009f88d8a662d5e8248aaad68631710/refakatawenoros.pdfIn PDF document text
- https://led7.ru/file/6680694889.pdfIn PDF document text
- https://producto.works/userfiles/file/bitured.pdfIn PDF document text
- 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_off0000d89f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD89F	19396 bytes
SHA-256: `19c61f5d74c6b5ed1f584a710b37dcaf52dadd8e1b1bfb1cbbc9f45d2a12af01`
`font_01_sfnt_off00010a35.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A35	10896 bytes
SHA-256: `a02c4d81ea4d48df846264e11457e25a397185d4db156ae4d8310fd89481d426`
`font_02_sfnt_off00012306.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12306	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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