PDF malware analysis — malicious · de9179f8726c557c

MALICIOUS

PDF

78.3 KB Created: 2021-07-01 20:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: bd072f648176f92a0984fa69957a9b41 SHA-1: aadc14d5b75d5e91768fa6201c615ad039afdc2c SHA-256: de9179f8726c557c1f17d4f6ae15b3a4e1a10bd3d2efbeb2a611d33660ca78fa

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The document body is unreadable, but the presence of external URIs and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9853

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://crysiq.ru/uplcv?utm_term=new+inside+out+upper+intermediate+student%27s+book+answer+key PDF link annotation
- http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1mmemqij6m2es01r8vtqhhtca6/86030896528.pdfIn PDF document text
- http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160837f6ec6356---91268823175.pdfIn PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6ac41e6bd2aeeb34b91e1ad84eaf3ad2/ninuzidowizojufedowiko.pdfIn PDF document text
- http://hrudolf.com/userfiles/24691621295.pdfIn PDF document text
- http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d1831fb55ce---1146519088.pdfIn PDF document text
- https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/d22e870c0946fef3fc93a12223242e04/rirujoxirolowizajob.pdfIn PDF document text
- http://hungbuloon.com/media/ftp/file/74049424024.pdfIn PDF document text
- http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/buwabalifij.pdfIn PDF document text
- https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/723b4d5015fcbdfec419cccdd022a9c4/11959191193.pdfIn PDF document text
- http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/8817671915.pdfIn PDF document text
- http://aiswaryamatrimonials.com/fck_uploads/file/66075314027.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607341263cfa4---xijiwer.pdfIn PDF document text
- http://amandamaitland.com/images/file/13891064635.pdfIn PDF document text
- http://aiswaryamatrimonials.com/fck_uploads/file/10763442989.pdfIn PDF document text
- http://studioindelicato.com/userfiles/files/gibef.pdfIn PDF document text
- http://beerskiboot.de/img/upload/file/62332490346.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099250d35a2d---pekiretulitisaguzam.pdfIn PDF document text
- https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/3101ff441cf4108854bf340d3c7859f1/43491988655.pdfIn PDF document text
- http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f2f425d5a---runat.pdfIn PDF document text
- https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/unipasj5o77uelmdc2sff6e3be/26696528625.pdfIn PDF document text
- https://anjingliar2.com/contents//files/12030165337.pdfIn PDF document text
- http://promador.pl/userfiles/file/tifepavewatenewo.pdfIn PDF document text
- https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/46fddvs4g6301hm41brkicb5bd/nuporaxifokasiwufuxosidaj.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/fc9a6478f4a09203bc2514ea961cb447/xekagadufujun.pdfIn PDF document text
- https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/6j5shdpebdjs1bkcdjlooc5jj2/90095859493.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e43183bb0---69348777035.pdfIn PDF document text
- https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a4d1511cd3b53bf578ea61afa001afb1/vularirikijeker.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_off0000c452.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC452	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dc69.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC69	11052 bytes
SHA-256: `9f9652d64e94d976802646a28a47323a0fcb5665c7165a43051eec6b4dfbb22a`
`font_02_sfnt_off0000f609.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF609	20784 bytes
SHA-256: `e7459086402998804c27af8f4a519e257a172577e1d2911fbc8590e399e30038`

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