PDF malware analysis — malicious · fc4ebdfe59964742

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 18:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: ec2b508c36b9d1efc763f98c2c914498 SHA-1: adc1340911c8cbe0a5a13ac203fbb9c4f99d135d SHA-256: fc4ebdfe59964742a744e380842d017ee41a0ec88b9f217d5c314a969ffb40ec

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous external URIs were extracted, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://smidgel.ru/uplcv?utm_term=i+am+not+able+to+install+any+app+from+play+store PDF link annotation
- https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/42935260383.pdfIn PDF document text
- http://uptindia.com/newsimages/file///xozenovasumufutalone.pdfIn PDF document text
- http://askaudit.ru/price/87558128634.pdfIn PDF document text
- http://toyotarent.hk/FileData/ckfinder/files/20210919_07769EE1D888BEAC.pdfIn PDF document text
- http://azinsaghf.com/cache/fck_files/file/70016691413.pdfIn PDF document text
- http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/1d6ca1b2f2e329aeb0d9251a459e64e5/77606778813.pdfIn PDF document text
- http://dajuicebarus.com/uploads/files/69403806101.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aaf43f29f---35228262147.pdfIn PDF document text
- http://studioturina.com/userfiles/files/wenadesiki.pdfIn PDF document text
- http://tcyy88.com/userfiles/file/2021090914331273499.pdfIn PDF document text
- https://aashianarealty.com/file/51686250304.pdfIn PDF document text
- https://shian-jin.com/UserFiles/files/bezajetafo.pdfIn PDF document text
- https://transmar.biz/ckfinder/userfiles/files/81001340908.pdfIn PDF document text
- http://www.allatpatikapecs.hu/images/file/lidojaniresorapisuki.pdfIn PDF document text
- http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140826be157e---19823938300.pdfIn PDF document text
- https://www.opsclown.it/ckfinder/userfiles/files/37030285538.pdfIn PDF document text
- https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141627d3c16f---japedomozofumujabewor.pdfIn PDF document text
- https://kaptenhoki.org/contents/files/gofozigirojiwutog.pdfIn PDF document text
- https://cooperadora.grupocreartel.com/documentos/archivos/fefedor.pdfIn PDF document text
- https://kmkmekanik.com/upload/ckfinder/files/wibowurifavivotutuga.pdfIn PDF document text
- https://ozmutludokum.com/userfiles/file/ragekaxipuzuti.pdfIn PDF document text
- https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614044b38f6c2---bujimulesuroxafopesiz.pdfIn PDF document text
- https://martabaktelor.com/contents/files/74650415622.pdfIn PDF document text
- http://jump360.co/upload/files/20210912050507.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_off0000d62b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD62B	10724 bytes
SHA-256: `767cdeefdc26f744d1af68c0740e5be47b6a0c2ff84ec9f654e1ef71970be5ac`
`font_01_sfnt_off0000ee8e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE8E	17468 bytes
SHA-256: `e0cbf6c4037ad42761a928a884b37f5457b28577a7e2ebd41deaa4af005faca2`
`font_02_sfnt_off00011bab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11BAB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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