PDF malware analysis — malicious · e8eb13a00b264468

MALICIOUS

PDF

74.0 KB Created: 2021-07-08 01:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 58e0d785ee59de3c8dbd26c7acbb2fa2 SHA-1: d99396963fa967b7a47fa1310102b06081fe77b4 SHA-256: e8eb13a00b264468e618fbae6fe8ffb5c5b239230fdd40e03a91c831345a186c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or engage in phishing. The embedded URLs and the nature of the link farm heuristics strongly suggest an attack pattern involving luring users to external malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://szpital-sulecin.pl/images/fckfiles/file/58423014772.pdf In PDF document text
- http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609017ec7abc5---33112285388.pdfIn PDF document text
- http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bc310120588---94417955801.pdfIn PDF document text
- https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f95090c81f401753d7b85f497899f19b/58663055072.pdfIn PDF document text
- https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a94dd3a46f---28127011434.pdfIn PDF document text
- http://whatifitspossible.com/ckfinder/userfiles/files/validegobuxoza.pdfIn PDF document text
- https://west-holding.com/userfiles/file/rupetakuzixopabe.pdfIn PDF document text
- http://asesorgubernamental.com/images/file/wivifugu.pdfIn PDF document text
- http://agro-pasz.pl/ckfinder/userfiles/files/2242141881.pdfIn PDF document text
- http://frutapacargentina.com/ckfinder/userfiles/files/numanugo.pdfIn PDF document text
- https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d2b538b6---11887369865.pdfIn PDF document text
- https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608865fbbc563---29714128108.pdfIn PDF document text
- https://szekszardportal.hu/userfiles/file/7343831209.pdfIn PDF document text
- https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/5e149515faeaf2ca6a2f0f4d70242a0c/zagosel.pdfIn PDF document text
- http://dentherapia.hu/files/file/buwofedipupagedupotokike.pdfIn PDF document text
- https://gikguamerica.com/userfiles/file/89643044351.pdfIn PDF document text
- http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609161b4ec325---97343757193.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafb682cecc---2800031220.pdfIn PDF document text
- https://kueapem.com/contents//files/moron.pdfIn PDF document text
- https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/9232792f869006736278a5e0fa98d286/vewopabumatisoma.pdfIn PDF document text
- http://gz-theoutfit.com/UploadFiles/FCKeditor/20210612111610.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0c13ddd12---77308975929.pdfIn PDF document text
- https://paroles-vives.com/ckfinder/userfiles/files/49886373725.pdfIn PDF document text
- https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/201aa2k512ijqotarnbrplocic/33799830570.pdfIn PDF document text
- https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ea35ab549---98142203222.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sony+dvd+recorder+rdr+hxd890+manualPDF 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_off0000bf87.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBF87	16152 bytes
SHA-256: `229bf9ed96b8af98925b837153bf78231761b8f4596d4493a80fbe2796662d8f`
`font_01_sfnt_off0000e83c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE83C	11232 bytes
SHA-256: `3d08fced82859d584aa5440ced90d48c82e28dc119ea03d16299785372fde5bc`
`font_02_sfnt_off00010268.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10268	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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