PDF malware analysis — malicious · 881d54f59b4eb962

MALICIOUS

PDF

85.0 KB Created: 2021-07-29 22:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 0043bcbc4fcd76bf8d82b1e51da696a2 SHA-1: 9971ccac8761ebeb041366b9ad3ee5895323dc13 SHA-256: 881d54f59b4eb962553ffc5fc12fc04bcb8922c9182efe8fb89ae2bc339aeff8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links to external websites, many of which appear to be hosted on compromised content management systems or disposable domains, suggesting a link farm designed to obscure the ultimate destination. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9934

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://garglob.ru/uplcv?utm_term=how+to+turn+on+emergency+heat+on+vivint+thermostat PDF link annotation
- https://mariellatriolo.it/public/file/tawitajewelonuzugufoj.pdfIn PDF document text
- http://arabstina.com/ckfinder/userfiles/files/babazixegoz.pdfIn PDF document text
- https://proektasis.gr/admin/spaw2/uploads/files/nodofo.pdfIn PDF document text
- https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/0l36pk564ue6apcg596i5v119p/jijubobusudiri.pdfIn PDF document text
- http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608985fb1c4e0---dulinuwolami.pdfIn PDF document text
- https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/18aaf7c61553e5403d9581442e2f0974/88029375751.pdfIn PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67dad432e---didesuvulanekakurofawised.pdfIn PDF document text
- http://zonazero.es/userfiles/file/nibitekijabadevubix.pdfIn PDF document text
- http://altaprecision.com/userfiles/file/85980855740.pdfIn PDF document text
- http://parkergeneralcontractors.net/userfiles/file/40304398298.pdfIn PDF document text
- http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/etfcdf06jmee6ndppfm865nhn5/68210932780.pdfIn PDF document text
- http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c72abbd2fff---30691672395.pdfIn PDF document text
- http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/53532766152.pdfIn PDF document text
- https://xo-sound.ru/userfiles/file/1167261163.pdfIn PDF document text
- https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/8f0557673ae549cd6b26f52cf4ff1036/52301778937.pdfIn PDF document text
- https://jamuiboe.com/webroot/upload_media/ridegekoradoxizoj.pdfIn PDF document text
- https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/e91fd49e7fded21f882f0ece89435d72/wukojexefawuxefopomu.pdfIn PDF document text
- http://ausafe.net/images/art/files/66351011718.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4200988269---27189776880.pdfIn PDF document text
- http://ddrwc.net/clients/869849/File/72186401379.pdfIn PDF document text
- https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749df50843c---sejaloditebabeluwudiwoke.pdfIn PDF document text
- http://phuketdriveschool.com/userfiles/file/42853602272.pdfIn PDF document text
- http://x04ydivan.ru/userfiles/file/mijeredezutasemewan.pdfIn PDF document text
- https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba7746822---kurodufufovenugoxe.pdfIn PDF document text
- https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/57f0623911b724bf1825a697a37bd99a/48429942638.pdfIn PDF document text
- http://speckrepeg.by/UserFiles/files/kukemipufomovunir.pdfIn PDF document text
- http://www.thaiboat.net/image/upload/File/79458923272.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_off0000e243.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE243	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fa5a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA5A	10988 bytes
SHA-256: `95907c725d980665e80ac344bcd41d8ed832a9255a8890be96af3126f1b9d8a4`
`font_02_sfnt_off000113bd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x113BD	18020 bytes
SHA-256: `b9fdeb088498622321bc7ddfcf157295c296923583471c0911882f212738b4d5`

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