PDF malware analysis — malicious · 7ca206cfb2a55133

MALICIOUS

PDF

89.7 KB Created: 2021-09-18 12:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: bb6d0a3653c6a4bba42172600906a33f SHA-1: da4653590a7de1cefc5884dfebd18193b55cb3c6 SHA-256: 7ca206cfb2a55133b7b739dfadc42eb79ded3b44988e5ca19713fee968643c3f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories and disposable hosting sites, indicating a link farm designed for redirection. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to malicious content, likely through a phishing or social engineering pretext.

Machine Learning

Nyx PDF Classifier malicious score 0.9937

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://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/c48271e0868ac3cc1b89f9fcb5f97033/32532931410.pdf In PDF document text
- http://mondoacquapiscine.com/userfiles/files/ropevuso.pdfIn PDF document text
- http://otelm4b.ru/admin/ckfinder/userfiles/files/dofusewujekiramefotavixe.pdfIn PDF document text
- http://fge-service.com/userfiles/file/koneturipusalumufa.pdfIn PDF document text
- http://mzch.pl/userfiles/file/54096998008.pdfIn PDF document text
- http://udmvdpo.ru/images/files/7299776916.pdfIn PDF document text
- https://nevisnews.com/userfiles/30577425921.pdfIn PDF document text
- http://cassotech.nl/site/data/ws/files/jitexijojeteberudav.pdfIn PDF document text
- https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/29d0937090d5b0d92961a8beb3e3ca97/gipasuxe.pdfIn PDF document text
- https://bodykneadstherapy.com.au/ckfinder/userfiles/files/feluv.pdfIn PDF document text
- https://skl.deindrukdemo.nl/upload/files/zafaf.pdfIn PDF document text
- http://oris-am.com/editor_up/79908906160.pdfIn PDF document text
- https://speak82.com/_UploadFile/Images/file/33715470373.pdfIn PDF document text
- http://rqconsultores.com/userfiles/file/13717919209.pdfIn PDF document text
- https://kanat.com/upload/ckfinder/files/96932232802.pdfIn PDF document text
- https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d376c81e2---javedasakesumotazigizudus.pdfIn PDF document text
- http://felixefontesadvogados.com.br/ckfinder/userfiles/files/dikegujikidatokijusiw.pdfIn PDF document text
- https://bc2000.order-pro.com/ckfinder/userfiles/files/64357765992.pdfIn PDF document text
- https://viboot.com/ckfinder/userfiles/files/857486682.pdfIn PDF document text
- https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/rauj1flb6m7a6jolrooa59t3ik/gowimofaxokiwesajezev.pdfIn PDF document text
- http://polaryachtmanufactory.com/res/wysiwyg/file/zaxujizesirelopesetija.pdfIn PDF document text
- http://bitite.lv/media/txt/122/file/36212656174.pdfIn PDF document text
- http://ranfeng.com/userfiles/file/2021-9///20219171245554444.pdfIn PDF document text
- http://ylphs.com/ckfinder/userfiles/files/vosowumufomorokabipep.pdfIn PDF document text
- http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161391b0844e76---30916528716.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=article+15+full+movie+filmywapPDF 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_off0000f885.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF885	18236 bytes
SHA-256: `31e90a87fd36e1bb26c5ff0bdfc0543d3f22d023447d506173d11c4d0118badd`
`font_01_sfnt_off000127e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x127E3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013ffa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13FFA	10904 bytes
SHA-256: `a668ac2fc04440031554865e2b7a691205bdb3ef0c12bedc40f4172e392c9846`

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