PDF malware analysis — malicious · efda317619f95fe5

MALICIOUS

PDF

73.3 KB Created: 2021-09-12 09:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 7d862ce27a56c6c5127ffcc60cc51815 SHA-1: 506e66e58622bdc75c64e881ad79e803084a77c4 SHA-256: efda317619f95fe5b41449579a6a50c65c878f51ff2168f13acae4c986109d23

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs. Heuristics indicate it's a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to directing users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://medvor.ru/uplcv?utm_term=android+ui+design+examples PDF link annotation
- http://gazetavk.ru/img/file/38962246514.pdfIn PDF document text
- http://ttlh.vn/storage/ckfinder/files/64938020478.pdfIn PDF document text
- https://flour.co.uk/ckfinder/userfiles/files/57316971723.pdfIn PDF document text
- https://vico-immobilien.com/ckfinder/userfiles/files/35923896391.pdfIn PDF document text
- https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/68125401282.pdfIn PDF document text
- http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/71825301503.pdfIn PDF document text
- https://divinenine.net/userfiles/file/lurajikaxelakofiw.pdfIn PDF document text
- https://bititechnika.com/uploads/file/fasulivi.pdfIn PDF document text
- http://topp.pl/_topp/file/vejominu.pdfIn PDF document text
- https://gopherscopes.com/userfiles/file/46368929331.pdfIn PDF document text
- http://music-summer-courses.eu/upload/files/84912647056.pdfIn PDF document text
- https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/cf7ac544121d9aa66ddc484f78c65802/bikiraxe.pdfIn PDF document text
- https://aprilboya.com/userfiles/file/47697890051.pdfIn PDF document text
- https://izyskately.ru/foto/ck/files/95659061108.pdfIn PDF document text
- http://cartopack.be/Images/file/kefabubuv.pdfIn PDF document text
- https://tourgardan.com/basefile/tourgardancom/files/mafedixogukovosipozo.pdfIn PDF document text
- http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/1182467673.pdfIn PDF document text
- http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d72b92c75a---51536460661.pdfIn PDF document text
- http://wadsoda.com/UserFiles/File/vikagavovedadubuvogufovo.pdfIn PDF document text
- https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ab94de915fe3a5b4b5df2f2dd7d4e08/9192230144.pdfIn PDF document text
- http://toflight.mobi/attachment/ckeditor/files/d4cd510e59ca0226f3692eed96a77742.pdfIn PDF document text
- https://www.sistemkabin.com/ckfinder/userfiles/files/87112664249.pdfIn PDF document text
- http://casaatlantida.com/userfiles/file///28267487085.pdfIn PDF document text
- http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134625f59c8a---jesifumikepadoforun.pdfIn PDF document text
- https://kolbandibileklik.com/resimler/files/4454535106.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_off0000bf47.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBF47	10820 bytes
SHA-256: `3363e8c6328942792db908b40596a03e8c48cecb714d5c1690a9a9ca17a4cba3`
`font_01_sfnt_off0000d7fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7FD	15552 bytes
SHA-256: `4103cd4bc716334e6671ae5b7ecb4d80b16808fdc0e7499eb1d88f32c18f75de`
`font_02_sfnt_off0000ffa5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFA5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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