PDF malware analysis — malicious · 830f0e41ffe8ea90

MALICIOUS

PDF

88.7 KB Created: 2021-09-19 02:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: e4c5c514f1b86af1f6651498175b057f SHA-1: 01c8b491d2c9679acf11adaa0f8719ae113c0ec1 SHA-256: 830f0e41ffe8ea90b1bef10120d018b1a6459d0b40f06c99b50f6158d405c69e

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, a common tactic in callback phishing and tech support scams. While no scripts were directly extracted, the presence of numerous embedded URLs, many pointing to compromised or disposable hosting, suggests an attempt to redirect users to malicious sites or download further payloads. The document body itself is heavily obfuscated and appears to be generated by wkhtmltopdf, likely serving as a container for these malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

Heuristics 7

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://krisoc.ru/uplcv?utm_term=which+is+the+smallest+android+emulator PDF link annotation
- http://studiotrusso.it/userfiles/files/77096862155.pdfIn PDF document text
- https://capitalsyndic.com/userfiles/file/19420998377.pdfIn PDF document text
- http://teranor.com/ckfinder/userfiles/files/xarokepezulorosubodid.pdfIn PDF document text
- http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161416accbb39a---91836062599.pdfIn PDF document text
- http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3d9a63d7---41841749466.pdfIn PDF document text
- https://volandovia.it/public/fileeditor/file/27582456501.pdfIn PDF document text
- http://heorungminhphat.com/luutru/files/rutukerital.pdfIn PDF document text
- https://nicklason.se/ckfinder/userfiles/files/walebawakaramowesomolan.pdfIn PDF document text
- https://zegaoyun.com/calisma2/files/uploads/24710036240.pdfIn PDF document text
- http://pensionpoint.cz/userfiles/files/xapigasigoxug.pdfIn PDF document text
- http://jrmhandling.nl/upload/file/mutijisisa.pdfIn PDF document text
- https://artistprasanna.com/userfiles/file/dumulopofunixa.pdfIn PDF document text
- https://machnik.net/ckfinder/userfiles/files/vuwaxebimonokuvalu.pdfIn PDF document text
- http://lesen-und-schenken.de/userfiles/files/43971036397.pdfIn PDF document text
- http://nano-vip.com/ckfinder/userfiles/files/natukuridogewurelevufazu.pdfIn PDF document text
- https://shevian.com/images/file/sedor.pdfIn PDF document text
- http://80tner.friend-match.com/upload/files/subobi.pdfIn PDF document text
- http://albertf.madteam.net/ckfinder/userfiles/files/22276086613.pdfIn PDF document text
- https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/6j2cgs7t2nntikh3u97b0hsovu/74920595070.pdfIn PDF document text
- http://bbhshipyard.com/userfiles/file/pesamajidu.pdfIn PDF document text
- http://dawahcity.com/userfiles/file/petulifulebebovejunaji.pdfIn PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ovhd1974un1bajc66ro49blsg1/ruzojufibirinaxuzores.pdfIn PDF document text
- http://studiosiciliani.eu/userfiles/files/tipalafatazon.pdfIn PDF document text
- https://www.rapn.ru/ckfinder/userfiles/files/34978434619.pdfIn PDF document text
- http://oguraclutch.cn/uploadfile/files/39234138630.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_off0000f62d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF62D	10728 bytes
SHA-256: `a372d16a52a1260b446c8d5c4455df06fe88bb92d54de4b9d4f6eda309c92e3e`
`font_01_sfnt_off00010eaa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EAA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000126bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x126BC	17904 bytes
SHA-256: `9d7468a13eb35c7f5298d36572e7c2a4c2cbc653e56a6ca9a279714eb0a7e3e4`

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