PDF malware analysis — malicious · e28fdf0ae0821155

MALICIOUS

PDF

80.8 KB Created: 2021-09-03 03:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: b662367198fc1bf1977273028a00fd98 SHA-1: 1392a573a4a8911d4cb19f78907e7eeb69892675 SHA-256: e28fdf0ae0821155b4c114eb0a4cf72abfe82a00378b70bb51c9c7a7aa0e263b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicates a phishing or malware distribution intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=proportional+and+nonproportional+tables+worksheet PDF link annotation
- https://leise.ru/admin/ckfinder/userfiles/files/41823827177.pdfIn PDF document text
- http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b5ea3e332d---52718942074.pdfIn PDF document text
- https://imotrading.com/images/userfiles/vajiduxavevopi.pdfIn PDF document text
- https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f4029c2c159ec17bec448ae61ec6f0a7/42317377991.pdfIn PDF document text
- https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/nepivok.pdfIn PDF document text
- http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f03c15f524---90009409392.pdfIn PDF document text
- https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/8ooqgqve88hrfmmv0bm0ojeotg/bivoxuzeluraxunig.pdfIn PDF document text
- http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/11607969597.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/74f9f66eaa13ef02e1d2872e1ac56ac4/jaxum.pdfIn PDF document text
- http://dancedynamicsla.com/clients/38740/File/giwedoforesifuwamezo.pdfIn PDF document text
- http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a95537025---mobafas.pdfIn PDF document text
- https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/p7423s6kn4plger1fr08anp0q9/31939294982.pdfIn PDF document text
- http://toeicspeaking.net/_UploadFile/Images/file/89110517135.pdfIn PDF document text
- https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ac04e123c8710a9062ed604e840d59c9/92352544122.pdfIn PDF document text
- http://gleneaglehoa.org/images/file/69370562648.pdfIn PDF document text
- http://vssteel1999.com/ckeditor/userfiles/files/vewesazipikisizap.pdfIn PDF document text
- http://canphantich.net/Images_upload/files/bagibonutozivuwubupuz.pdfIn PDF document text
- http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/81235920212.pdfIn PDF document text
- http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609231d637864---74962710720.pdfIn PDF document text
- http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4bb52ac88---fabowisajakazivenata.pdfIn PDF document text
- http://boxethai38.com/upload/file/41310514275.pdfIn PDF document text
- https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/fupasozug.pdfIn PDF document text
- https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077891ff2081---lerol.pdfIn PDF document text
- https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/jurogpp76k9nh1a0v2f1etr3iu/sufowi.pdfIn PDF document text
- https://www.autopsrus.com/ckfinder/userfiles/files/lonuroritarofunaronituvi.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_off0000d59b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD59B	18192 bytes
SHA-256: `c26006be2e5e3acc5b32ffa9ade3fb108b16f6edc6611932db5933929b30bd04`
`font_01_sfnt_off00010465.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10465	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011c7c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C7C	10808 bytes
SHA-256: `030a265a8b3514c3e6921e02d1f14723da4d5651ad590b2bad1ecca3fbfe8e1f`

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