PDF malware analysis — malicious · 8ea1b4451ea9ab1f

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 00:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 5e4c8ec8b610caba4d4c8960aac8a63e SHA-1: e95676cead3a0d6661c38c95c70bd0a69b76511e SHA-256: 8ea1b4451ea9ab1fd5946a6dcd7705483ae6da8f9b7315380c3a4b104f4a424b

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The presence of JavaScript suggests an attempt to execute code, likely to facilitate redirection or further payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

Heuristics 6

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 http://uniquecharacters.com/upload/files/54606840819.pdf In PDF document text
- http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/woririfijigimipulo.pdfIn PDF document text
- https://huaienclinic.com/uploadpic/files/mibeno.pdfIn PDF document text
- https://aecvfcom.nrgence.com/upload/userfiles/files/ruwivozaguwomaboragex.pdfIn PDF document text
- http://studiotecnicoarduini.eu/userfiles/files/vikafazoxib.pdfIn PDF document text
- https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/14145130666.pdfIn PDF document text
- http://chip-chup.hu/upload/file/gijedopituwezezowat.pdfIn PDF document text
- https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9e62df1dcc798a888d06f2a8be1e8a1e/12187471241.pdfIn PDF document text
- http://wangyiphk.com/userfiles/wukudetotuzule.pdfIn PDF document text
- http://fratellilongoni.com/userfiles/files/nedulifuwaz.pdfIn PDF document text
- https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130916270d61---3594966258.pdfIn PDF document text
- http://intimatehotelpattaya.com/image/upload/File/94627824416.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/4ef01961d1331a14f4ee40c6b3bb6617/wosimogubigodeforurin.pdfIn PDF document text
- http://www.deewanalarab.com/up_imgs/46278698556.pdfIn PDF document text
- http://tupnate.com/ckfinder/userfiles/files/6599464412.pdfIn PDF document text
- http://www.leposeur.fr/site/upload/ckfinder/files/59177566280.pdfIn PDF document text
- http://tsutae-f.com/js/upload/files/dipebagonobujowil.pdfIn PDF document text
- https://ingatlansos.hu/images/userfiles/file/nuluwalegasarunusularusev.pdfIn PDF document text
- http://stringquartet.biz/web/images/fck/file/34759199315.pdfIn PDF document text
- https://nasco-ye.com/uploads/file/sogumar.pdfIn PDF document text
- http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/sibidobixasefovozusabofu.pdfIn PDF document text
- https://10fci.net/userfiles/file/mexegebobir.pdfIn PDF document text
- https://megashina24.ru/files/files/zizubadimatasiparekovonek.pdfIn PDF document text
- http://noclegsosnowiec.pl/eurostyl/photos/file/10618167174.pdfIn PDF document text
- http://progfin.pl/userfiles/file/59218833591.pdfIn PDF document text
- https://fullprotec.com/ckfinder/userfiles/files/3337767858.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+application+programming+with+opencvPDF 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_off0000d826.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD826	10924 bytes
SHA-256: `4bcb35795a31677b2c7dd70fef93148980cc92df161d8274035af9012712468b`
`font_01_sfnt_off0000f115.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF115	18528 bytes
SHA-256: `9d9a6a54e2c22167a25dbc51e58ea144dab949cee5ead2c1844ee4ae6c76d192`
`font_02_sfnt_off00012155.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12155	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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