PDF malware analysis — malicious · de7d085f8636f967

MALICIOUS

PDF

86.1 KB Created: 2021-09-01 07:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 326074ec770820e2c522f4a0451358e0 SHA-1: 922e1f952fdb2c5ee52e8355458b3b7f615902ef SHA-256: de7d085f8636f967dbdea298fd9b9912bbf33a78fb2c8529c0069f66343d5610

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific exploit indicators implies the document may exploit vulnerabilities to execute code or deliver a payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://cructi.ru/uplcv?utm_term=lips+are+rough+but+not+chapped PDF link annotation
- http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc9ddc79ca---63165547664.pdfIn PDF document text
- http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b673ce08eb---zujabexisijivudiro.pdfIn PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ba6fb57831f5d1c934ad7a97d7d9cc24/jarezomelefixu.pdfIn PDF document text
- http://global-insurance-broker.de/downloads/40601062242.pdfIn PDF document text
- http://nextgt.eu/uploads/file/mobizeje.pdfIn PDF document text
- https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/3a4b3633112cfee9d086676ad7d24283/vezajafujejidibukige.pdfIn PDF document text
- http://gwhs79.com/clients/867100/File/48042506558.pdfIn PDF document text
- http://upasamed.org/Content/uploads/files/30752575798.pdfIn PDF document text
- https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e1490299---83193216027.pdfIn PDF document text
- http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7547ce33d1---53663790732.pdfIn PDF document text
- https://bestwaynepaltrek.com/ckfinder/userfiles/files/87902647059.pdfIn PDF document text
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/5f224359785357b3c621d417789a39cd/lavorumajarepedavu.pdfIn PDF document text
- http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d1f8e2150---99344285091.pdfIn PDF document text
- https://volnynaklad.cz/data/file/81157261496.pdfIn PDF document text
- http://be-now.pl/userfiles/file/zovakizi.pdfIn PDF document text
- https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611ea2d430a3d---sefafuwaxoz.pdfIn PDF document text
- https://saleskerala.com/ckfinder/userfiles/files/ragukidijajagavoseza.pdfIn PDF document text
- https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/log04unqo93gc8mb7jveob1hkr/ranigotigodu.pdfIn PDF document text
- http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160adb303d8a0d---73368657584.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb9b8c334778e06c457e1d1a7d4f1bab/95801138094.pdfIn PDF document text
- http://giftboxvietthuy.com/upload/ck/files/wutavavisigusajo.pdfIn PDF document text
- https://medtek.vn/storage/file/51807325726.pdfIn PDF document text
- http://vietthanhstone.com/images/news/file/farelixuxolokimosobaris.pdfIn PDF document text
- http://watthaistuttgart.de/userfiles/file/jiwijodusope.pdfIn PDF document text
- https://interior-mark.com/ckfinder/userfiles/files/44602089838.pdfIn PDF document text
- https://kientrucqhouse.com/uploads/image/files/separiwomirimurijopigudo.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_off0000eb29.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB29	10944 bytes
SHA-256: `73ce7495795e1a568020e97061c24ec8686e48e784e57a86c6abb412fcb74ed5`
`font_01_sfnt_off00010413.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10413	17816 bytes
SHA-256: `ba1b5e4e59aa6602f74dbeee128287ab8c24cdb2e95342648bf294d24f52d0a8`
`font_02_sfnt_off00013274.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13274	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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