PDF malware analysis — malicious · 23e8bc5af95c3265

MALICIOUS

PDF

76.5 KB Created: 2021-07-24 07:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: ebad6a33d4ad188830f783b6e87596f4 SHA-1: 1c7febb924e401a1c955fbdd35396c2c92e8690d SHA-256: 23e8bc5af95c32655d18b7890a3bf52b08d07b8d572f1302d58de286ae850b9f

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 contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or engage in phishing. The PDF structure itself is also noted as having duplicate object bodies, which can sometimes be used for obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 0.9936

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 http://boldogelet.hu/media/nomuxubi.pdf In PDF document text
- http://limoride.net/gallery/file/tiwepesisovamulafi.pdfIn PDF document text
- http://poultech.net/d/files/foxelowugujila.pdfIn PDF document text
- https://ferado.vn/userfiles/file/53728635426.pdfIn PDF document text
- https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/9dfc39e7e3f7bf5e8852bdfd6f6a212e/88388940346.pdfIn PDF document text
- http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079300db60b5---26750389950.pdfIn PDF document text
- http://aarogyamedico.com/userfiles/file/vufajunekidigam.pdfIn PDF document text
- https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/62d716fb7d70eee162989a980a830dd6/suzowito.pdfIn PDF document text
- https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/f7e15kqi39qtd60rfne7mrrhgq/51193929855.pdfIn PDF document text
- http://hotelpenza58.ru/ckfinder/userfiles/files/28202185781.pdfIn PDF document text
- http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c98bbf76272---japuwilumokiw.pdfIn PDF document text
- https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606e5cb99a235---50465776148.pdfIn PDF document text
- http://ingmontagna.com/userfiles/files/63958188172.pdfIn PDF document text
- http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d10abce287---1528289047.pdfIn PDF document text
- http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a259bc08084---jemofososebumur.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b364611f1---bewil.pdfIn PDF document text
- https://emons-verlag.com/testarea/cwsCMSlight/media/files/73969699602.pdfIn PDF document text
- http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5050f538b9---venanatevuvudozerolalit.pdfIn PDF document text
- https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/grb4ed0b81153dgkk6io2sbfb5/44744760676.pdfIn PDF document text
- http://kaupa.cz/userfiles/file/88551583360.pdfIn PDF document text
- https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/50b04adcfb685e99cdfccda2bfafbae2/25200857920.pdfIn PDF document text
- http://malbreil.com/userfiles/file/mamibozuxiv.pdfIn PDF document text
- https://justbuymeds.net/userfiles/file/bewenigagemawimagalaloti.pdfIn PDF document text
- https://simplehome.ro/ckfinder/userfiles/files/movurawigizekivuwinodu.pdfIn PDF document text
- http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d6f4f3631---nuxerol.pdfIn PDF document text
- https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816e4595379---64756544254.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=frick+industrial+refrigeration+-+waynesboro+paPDF 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_off0000c236.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC236	11336 bytes
SHA-256: `c834437b7eb0282a9694ed9b101a3a5c1e0176bcb98397610417f7e810abad20`
`font_01_sfnt_off0000dcbc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCBC	17912 bytes
SHA-256: `a57c29f48beeaa42498dd8a4f0f658cf8554260dfc07403a5aac69cd0aaadffd`
`font_02_sfnt_off000108f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108F7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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