PDF malware analysis — malicious · fc60f9a3f70e4cc6

MALICIOUS

PDF

72.7 KB Created: 2021-09-28 23:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 6779dd163fc4846edf593af7e2cf452b SHA-1: b6a8176e81b46f7c96f32ccf062871b3f94b8734 SHA-256: fc60f9a3f70e4cc6d64b806bd0202fb689c309f35143f0252c72a7cf310e7e7e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to external URLs such as 'https://inwebjor.ru/uplcv?utm_term=chrome+91+features'. These links are hosted on various domains, some of which appear to be compromised WordPress sites, suggesting a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=chrome+91+features PDF link annotation
- https://jackyrouxmethode.com/userfiles/file/31205409114.pdfIn PDF document text
- http://clinicaveterinariasangiacomo.it/userfiles/files/vibirefe.pdfIn PDF document text
- http://kubablimel.pl/Image/files/44959077850.pdfIn PDF document text
- https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/4f53e56cd56034ceb204197c3330cf6f/denesikujevopasobo.pdfIn PDF document text
- http://kanizsakran.hu/userfiles/file/94816812607.pdfIn PDF document text
- https://forumsevens.com/images/file/69772097233.pdfIn PDF document text
- https://adasms.fr/userfiles/file/36540045671.pdfIn PDF document text
- https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/74064132073.pdfIn PDF document text
- http://architettomontanino.eu/userfiles/files/83343093399.pdfIn PDF document text
- http://geostudio.eu/userfiles/files/siwemuribebixonu.pdfIn PDF document text
- http://stl-hk.net/userfiles/14279682217.pdfIn PDF document text
- https://contemporaryteas.in/admin/uploads/file/39255167796.pdfIn PDF document text
- http://gsemilia.it/userfiles/files/gojatu.pdfIn PDF document text
- http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613107f0a30c3---sutisubagujufujuzufesiva.pdfIn PDF document text
- https://bakwanudang.com/contents/files/nujodozixefapejedejorax.pdfIn PDF document text
- http://mabo-meccanica.eu/userfiles/files/75752339990.pdfIn PDF document text
- https://khanoomhoteli.com/basefile/khanoomhotelicom/files/38820614899.pdfIn PDF document text
- http://mgocsm.in/userfiles/file/viletevopo.pdfIn PDF document text
- http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432dbd619ec---gizefisujosobisetoro.pdfIn PDF document text
- https://spcinternational.in/ckfinder/userfiles/files/jisumowisewarupupege.pdfIn PDF document text
- http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e4000637043388f9fce58ecf3bd025b3/40868090022.pdfIn PDF document text
- https://eltdb.com/UserFiles/files/65962160072.pdfIn PDF document text
- http://xinxinhouseware.com/uploadfile/files/devivajepokizarixa.pdfIn PDF document text
- https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d5b32297d---lupawesabota.pdfIn PDF document text
- http://techscreening.com/userfiles/files/xotonujorigu.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_off0000b682.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB682	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ce94.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE94	17552 bytes
SHA-256: `686f7b56ea005da172dd718995eba11c00d5a7834ef661b36d642e908f267955`
`font_02_sfnt_off0000fb98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB98	10588 bytes
SHA-256: `f96727bfd0067fa25dbe20b62c52c6fc54735f4d597fcac38588cd1c15ba4a0a`

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