PDF malware analysis — malicious · bf2904070e726d17

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 22:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 7f51554f15b2ff371bc31e38494bf613 SHA-1: 947d52487ecd51ff3ff5ca6301e09876a3597136 SHA-256: bf2904070e726d17f0b6c11a6b2d529c4990c10f2820cb6172811d52af6149d2

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as lures for phishing or to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=software+per+android+gratis+italiano PDF link annotation
- https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/377e7e08e3b772cdd8d7fc67ba13fab1/52753218978.pdfIn PDF document text
- http://thesciencenetwork.org/uploads/files/simeguburapofase.pdfIn PDF document text
- https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef3cd7dc91---58142228266.pdfIn PDF document text
- http://birdwatching.sk/media/file/xukaz.pdfIn PDF document text
- http://3e-machinery.ru/app/webroot/filesfiles/popafarisazevopavidilojag.pdfIn PDF document text
- http://grupopiscis.com/upload/files/90853231336.pdfIn PDF document text
- http://haohanlegend.com/Uploadfiles/files/bebapimo.pdfIn PDF document text
- http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f116dcfe5e---35258441147.pdfIn PDF document text
- http://nawooelcs.com/upload/userfiles/2021/09/files/210912165335.pdfIn PDF document text
- https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/jakafudinorum.pdfIn PDF document text
- http://pronobile.de/catalog/file/mopadiwawabitifogorage.pdfIn PDF document text
- http://weddingdove.tw/uploads/files/202109120550497171.pdfIn PDF document text
- https://hainutedecopii.eu/ckfinder/userfiles/files/zazufesu.pdfIn PDF document text
- https://phukienbep.net/media/files/86356766054.pdfIn PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613d79e7919d2---3617806035.pdfIn PDF document text
- http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1773765918.pdfIn PDF document text
- http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/4831766303.pdfIn PDF document text
- https://eguiders.com/uploads/94046981905.pdfIn PDF document text
- http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2c59ca5ef---2407487419.pdfIn PDF document text
- https://nevjegyzek.eu/uploads/file/11002590124.pdfIn PDF document text
- https://krygina40.ru/UserFiles/File/womuxowisegota.pdfIn PDF document text
- http://thephinhmienbac.com/upload/files/mobewodetirivakiram.pdfIn PDF document text
- https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/xalefiwimepametumum.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_off0000d56f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD56F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ed81.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED81	17600 bytes
SHA-256: `f4d376723a83241a702d505bcda4b6de87ba7c0b678a646c9414ed9582dc8fdb`
`font_02_sfnt_off00011ac9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11AC9	10832 bytes
SHA-256: `4cae218e3dc3a79a4e73ba6fe0d050bd0dfd56cc7ec80215acf97cfdbe614c55`

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