PDF malware analysis — malicious · 3e259d390ce81cf2

MALICIOUS

PDF

83.7 KB Created: 2021-08-21 14:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 73e08c906c01a99e775a33a69874c5d7 SHA-1: c8bec406961dd64a9019e5d12853f63e6bb6513d SHA-256: 3e259d390ce81cf2cb1fa467d10506043e61f33839c8da2e28e48968cee51b3c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content distribution attempt. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to manipulate search engine results or redirect users to malicious sites. The presence of multiple external URIs and link farm characteristics strongly suggests an intent to lure users to external, potentially harmful, resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9902

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://kientrucphatloc.com/upload/files/82069889875.pdf In PDF document text
- https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7afdfb65880928bbaf63c7a93f04ea0/32562435262.pdfIn PDF document text
- https://forthepeoplegov.com/userfiles/file/46258159620.pdfIn PDF document text
- https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/27d751c95dc42f5ae5c0555e81ef51f9/31901791524.pdfIn PDF document text
- https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1a744e0073978299f64d91ef9b7c077a/305046183.pdfIn PDF document text
- https://dacsanmyhuongbeti.com/app/webroot/files/images/pages/files/21211220232.pdfIn PDF document text
- https://taxfirma.com/userfiles/file/81844484921.pdfIn PDF document text
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a5189b7a4---26773437369.pdfIn PDF document text
- http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/xobefujagix.pdfIn PDF document text
- http://isagenixmakessense.com/ckfinder/userfiles/files/24589716486.pdfIn PDF document text
- http://futurepoolandspa.com/ckfinder/userfiles/files/susixojurewezisorepurox.pdfIn PDF document text
- http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e46bdb420---57715272370.pdfIn PDF document text
- https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/pjh6trtdnkn022r5rq4pf3v249/nuwaduzovafu.pdfIn PDF document text
- http://korsorlampang.net/user_img/files/pumozesopu.pdfIn PDF document text
- http://traiteur-ribot.fr/userfiles/file/12338900551.pdfIn PDF document text
- https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/6a2eb381bb55e5310d10f495ec30f3b3/dikapexi.pdfIn PDF document text
- http://carsonpokebar.com/uploads/files/tarafipirupimekapudivate.pdfIn PDF document text
- http://architettomontanino.eu/userfiles/files/tesimovaboti.pdfIn PDF document text
- https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/5b64b057be1c7ca2ff6823ad20df5786/77102998126.pdfIn PDF document text
- http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089396b7fee3---pikerejixuk.pdfIn PDF document text
- http://xn--365-pn7mwb654m2qn.com/ckupload/files/51008124115.pdfIn PDF document text
- https://altonika.pro/files/fck/file/45275244331.pdfIn PDF document text
- https://mariellatriolo.it/public/file/toburubunurik.pdfIn PDF document text
- https://salvamontbihor.ro/app/webroot/files/userfiles/files/33732097231.pdfIn PDF document text
- https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0e751816666eedac856cd73319273dbd/82567002594.pdfIn PDF document text
- https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/1dc7f25f398d72d38dfa7042b29deb59/69287960099.pdfIn PDF document text
- http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854d352a058---rowuka.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+write+phd+annual+progress+reportPDF 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_off0000e494.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE494	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fca6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCA6	16256 bytes
SHA-256: `ddda24ee9e7a1bd8ef9a44e2489577a67c1fbdbbae85589bf69f0d66b7ca1628`
`font_02_sfnt_off00012698.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12698	10848 bytes
SHA-256: `7c897d9a64a4b35c766154008e9b87f72558a5bacf2f4721e945b4502b133e48`

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