PDF malware analysis — malicious · 9e87534de24461c4

MALICIOUS

PDF

90.5 KB Created: 2021-08-03 02:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: cfdf0791a0d1cec9d73f50211b483a7b SHA-1: b63d2d3816385dc2ab267b2101410b0e873f0748 SHA-256: 9e87534de24461c4de42cb5063f1fc105506abeadf4d337b8846a9bb01f7b243

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to numerous compromised websites, likely to facilitate phishing attacks or distribute further malware. The presence of embedded URLs and the nature of the heuristics strongly suggest an intent to lure users to malicious destinations.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/uplcv?utm_term=how+to+reduce+weight+with+liquid+diet PDF link annotation
- http://rallyteamwalraven.nl/file/bujizob.pdfIn PDF document text
- https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/f6f3789273905151fcfceceadd10a3a2/49205709718.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab915157c5a---67249669877.pdfIn PDF document text
- http://bfr-bialapodlaska.pl/userfiles/file/dupurufuvenuwadozodal.pdfIn PDF document text
- http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/qo5n1ils3e3c0iqan9jafm6059/56615308851.pdfIn PDF document text
- http://farmaciafasolis.eu/userfiles/files/dulerorapunenitelen.pdfIn PDF document text
- http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/58263474140.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/sgr2vor44ijucb7p06bu837dnu/wajidiramiwobatemavuf.pdfIn PDF document text
- http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16071635995ac2---purarebitowigumeru.pdfIn PDF document text
- https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d4491c65d---xumirodimenigunuwusox.pdfIn PDF document text
- https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/m0bdn5c0tlm2aqnn13hdj1goof/84906686335.pdfIn PDF document text
- http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c35a65a6804---55934500032.pdfIn PDF document text
- https://olympicwroclaw.pl/zdjecia/fck/file/45973068986.pdfIn PDF document text
- http://nadiadsa.org/userfiles/file/xulote.pdfIn PDF document text
- https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/oducrmgnqq0jrvir616monfl28/24830162833.pdfIn PDF document text
- https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/21474574222.pdfIn PDF document text
- https://uleshuzataruhaz.hu/files/file/24099772999.pdfIn PDF document text
- https://btegypt.com/file/66989583624.pdfIn PDF document text
- http://zamel2.pl/userfiles/file/58520377356.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f91962a8e5---13056678621.pdfIn PDF document text
- https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16088c1fda8019---sekulekegazakarojojedi.pdfIn PDF document text
- https://songhong.info/userfiles/file/kufur.pdfIn PDF document text
- https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/52bd9fbfcf074a2dd7612cc9b5689dc8/60005606746.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a760daeea6d---sapetatutubeta.pdfIn PDF document text
- https://happycolaborativo.com/uploads/files/35667387794.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_off00010123.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10123	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001193a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1193A	10540 bytes
SHA-256: `d7dc80481f066d8e6fe7739a2d0f186093dee026cae95ed37f53853d85f0854c`
`font_02_sfnt_off000130cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x130CD	16464 bytes
SHA-256: `cd5dd921642caafcc5da3c14cdc48db9c9fda4ee8f26bf82b4c75d835047edd7`

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