PDF malware analysis — malicious · 5a601951b91b7f2a

MALICIOUS

PDF

85.6 KB Created: 2021-07-06 23:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 37d3a70e7375a2519d97c94969470f10 SHA-1: 543887db3f63a7844015c23fbebd1f37ad07633d SHA-256: 5a601951b91b7f2af7ed21e811ee1eaf2f7fa17b94d271f58147a66d47a3356d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The presence of 'utm_term' parameters suggests a phishing or SEO-based lure. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=doctor+who+donna PDF link annotation
- http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/43580553423.pdfIn PDF document text
- http://nousgarage.com/userfiles/file/majetuwajadaloviliwat.pdfIn PDF document text
- https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/bd34f2435a745d0d78c6d5334b99e3f0/tebejefalowaxixinekugemak.pdfIn PDF document text
- http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607916027b740---wovurugewabipufinuketuk.pdfIn PDF document text
- https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/091c08859c282b157247c1a42eaad40a/jizetejunanimamakib.pdfIn PDF document text
- http://chhsclassof70.com/clients/1/1f/1f6d1b94cf555b90b9f410dfa82aea5f/File/joputujukikukol.pdfIn PDF document text
- http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cd0a8ab01---timorapoduvuwogegupa.pdfIn PDF document text
- http://sashtraayurveda.com/ckfinder/userfiles/files/82264271148.pdfIn PDF document text
- https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/02bb97e02aa6c70f3d334077d5228f63/kovigozorobasoderotuj.pdfIn PDF document text
- http://bptramptour.pl/files/file/zivafile.pdfIn PDF document text
- https://artbynela.com/uploads/file/dafipunejenepexodavoze.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc69c86506---47886659442.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb607d9e6d---fuliwadaposoka.pdfIn PDF document text
- https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d58a26dc33e795f7d6d205555451c4c0/55634465505.pdfIn PDF document text
- https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/afbf22595ac010887ae3d4028697d56b/27244964456.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f292d1e28c---1383393643.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ba54ej6ahmn5mi9dt09pfa63m0/tivakiwijoxofogovimosazer.pdfIn PDF document text
- https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/f4a96d0814c1081dd1ab9dad34b8f0ac/xomexenosi.pdfIn PDF document text
- http://maslag.eu/userfiles/file/3897537095.pdfIn PDF document text
- https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a60db54aa074c3e025655a032732146f/sitatibaxugape.pdfIn PDF document text
- https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b508a4931---serojalizopuked.pdfIn PDF document text
- https://monographie.com/ckfinder/userfiles/files/21114205315.pdfIn PDF document text
- https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/9f2f5e02eb5ffffb6aa0be7dcc0681ff/kunowuzegirumebo.pdfIn PDF document text
- http://anthonyvienna.com/sites/default/files/file/xotut.pdfIn PDF document text
- http://pro.ovh.net/~tribuene/images/banque/file/ludevaduwet.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_off0000ed8d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED8D	16960 bytes
SHA-256: `a8c935f03f48169e10457c0b93d24011a5b57b9c0434fb3643b357103f0c4cc9`
`font_01_sfnt_off0001198f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1198F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000131a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131A6	10116 bytes
SHA-256: `2973512b6b6e21e885c5e0bd0efe0959b2a96ac34624365a7ae108c163c49d42`

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