PDF malware analysis — malicious · 18a97be6931b805a

MALICIOUS

PDF

77.2 KB Created: 2021-09-10 16:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 4b45dbc47d7194130c3cbfd581a9c5b0 SHA-1: 2881e8c2b9fcb065604b23945b5ff91482e721bd SHA-256: 18a97be6931b805a71f2ae3d11b1bd01ce586f263e7d404d885625974397784e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a tactic to distribute further malicious content or phish for credentials. The presence of a link farm on disposable hosting further supports a malicious intent to obscure the ultimate destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

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 http://medizator.ru/ckfinder/userfiles/files/64904915865.pdf In PDF document text
- https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/75473945194.pdfIn PDF document text
- https://tenekedjieva.com/uploads/file/lunebefiledo.pdfIn PDF document text
- http://tmacfashion.com/ckfinder/userfiles/files/33485699211.pdfIn PDF document text
- http://rasmesafar.net/basefile/basefiles/gopakudadisagoxetewo.pdfIn PDF document text
- https://endeligmandag.no/e-brev/data/div/jusewalawedipilug.pdfIn PDF document text
- http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613419e32b53b---30909946402.pdfIn PDF document text
- http://www.pattyn360.com/upload/forum/files/73094037171.pdfIn PDF document text
- https://portalbime.com/UploadedFiles/New/file/18737920555.pdfIn PDF document text
- https://jagominum.com/contents/files/16164464737.pdfIn PDF document text
- http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea6956cead---kukelevuragazalanul.pdfIn PDF document text
- https://maisonforville.be/documents/file/39405893434.pdfIn PDF document text
- https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/98sjrge2ajtrkgt4t3mhhavsq1/76269895548.pdfIn PDF document text
- https://argentinaproduct.com/ckfinder/userfiles/files/jetivovedejedenewubunawul.pdfIn PDF document text
- http://abwjefferson.com/uploads/files/40652269822.pdfIn PDF document text
- https://chsins.tw/uploads/files/202109080836397085.pdfIn PDF document text
- http://absolutelyneon.com/userfiles/file/bemebivuvapasoxejuz.pdfIn PDF document text
- https://fertilizerproductionprocess.com/d/files/98401617081.pdfIn PDF document text
- https://megashina24.ru/files/files/31488040144.pdfIn PDF document text
- http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136a21fe2125---gugajelij.pdfIn PDF document text
- http://czernavendeghaz.hu/admin1/file/1843664476.pdfIn PDF document text
- http://ventima.ru/userfiles/file/zivusowamovexerezasu.pdfIn PDF document text
- https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161341af8900aa---67809703990.pdfIn PDF document text
- https://samirkumarpaul.com/ckfinder/userfiles/files/74559533039.pdfIn PDF document text
- https://airshow-bg.com/file/xatavubagafefep.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=survival+fire+battlegroundPDF 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_off0000c127.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC127	20540 bytes
SHA-256: `c5462566b0085e2c1d93c4205ee35e93a8313d5e9123fc1eb8a1a4839167cacd`
`font_01_sfnt_off0000f69e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF69E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010eb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EB5	10740 bytes
SHA-256: `461803dd8ea5c393aed5536fbe2f41ba0f77e9a3b83c5acabeec7473bc7a66bd`

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