PDF malware analysis — malicious · 637c6d15675ff4fc

MALICIOUS

PDF

99.9 KB Created: 2021-08-13 03:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29

MD5: dc846a86f8fc899ae7576ff618cdc553 SHA-1: 15a8ae1b596cda30cc76204cc20be88daeeb2e01 SHA-256: 637c6d15675ff4fc8dfe59d0616a0e220f982ed9b2f047b9defbea12efee42c4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://infrive.ru/uplcv?utm_term=jerusalem+old+city+gates+map PDF link annotation
- https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd52518e848---35097037239.pdfIn PDF document text
- https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d0539eae3---dedonebo.pdfIn PDF document text
- https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/siimi64ofruuc49a2i7m17ej62/90636131421.pdfIn PDF document text
- https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/dhgc5irih4680euas4g0lhe713/21328912331.pdfIn PDF document text
- http://jhdjt.com/images/upload/File/rozanixebosovi.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b0c3a1b7ef42ba461f0f538b9c577264/73985121509.pdfIn PDF document text
- http://aqcons.vn/upload/files/2566995628.pdfIn PDF document text
- https://bhsbeacon.com/FCKeditor/file/xipasasixopelafotafoponi.pdfIn PDF document text
- https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160874ed27725f---54877364653.pdfIn PDF document text
- https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4006aed9c---92564868791.pdfIn PDF document text
- http://bulmarconsult.com/files/kititidokijativibuxib.pdfIn PDF document text
- http://aodaibooking.com/FileData/ckfinder/files/20210612_D752F45E812CC641.pdfIn PDF document text
- http://akicgiyim.com/userfiles/file/lowojidubapukir.pdfIn PDF document text
- https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/b5cc22586b0d7754dea5bfb9c1d17f8b/famakajiwoworifovuv.pdfIn PDF document text
- http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4640e85e6---voxevanope.pdfIn PDF document text
- http://baigeleather.com/userfiles/file/fusujezib.pdfIn PDF document text
- https://uzunlarpeynir.com/dursun/upload/files/nutipapi.pdfIn PDF document text
- https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/43a3e81a49c7bf22a0e6e3ed97c784d0/xukuxewademetipuriniwo.pdfIn PDF document text
- http://flexa.cz/docs/file/15958404224.pdfIn PDF document text
- http://vipforiraq.com/userfiles/files/risiwitirovukemidirumis.pdfIn PDF document text
- http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e81a88abbb---vidogutozigulokuzonep.pdfIn PDF document text
- http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a56f5f757---nikuvi.pdfIn PDF document text
- http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bbccf3a28bd---18249295298.pdfIn PDF document text
- https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/3dff0ee849d2e9d81307e27c5b44eae8/61875609724.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fa4f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA4F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011261.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11261	17756 bytes
SHA-256: `6c5f7620a30ef0c83cc5b89de11f30a275cdf09a8a09248ddcbea3fbf11d7a62`
`font_02_sfnt_off00013fae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13FAE	10960 bytes
SHA-256: `08d6e55e93028e9426fc33cbff4c55610e606dfb17f240ec1ea71d98728d4d0a`
`font_03_sfnt_off000158fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x158FC	22132 bytes
SHA-256: `328f91f829c3e632ddd8ee8ab39a0063a78a3d3ad7ac6df7f2fabafc6ef8d668`

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