PDF malware analysis — malicious · 8dde393076c26642

MALICIOUS

PDF

73.7 KB Created: 2021-09-16 20:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 5e1249953994e791180dd7a94186c624 SHA-1: 8b92e11b8b33ae447d5ed7c94cfb9488b3375b5f SHA-256: 8dde393076c26642a97cbe54450ba7e02ba5d16f7d36af325d322a78ae25dde6

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://medvor.ru/uplcv?utm_term=drag+racer+v3+top+speed PDF link annotation
- https://taiwancy.com/app/webroot/userfiles/files/71550362455.pdfIn PDF document text
- http://tuderprogettazione.it/userfiles/files/40064406918.pdfIn PDF document text
- https://zapcdn.space/web/img/podborky/files/sewebuxuz.pdfIn PDF document text
- https://mogilew.ru/userfiles/file/1402509308.pdfIn PDF document text
- https://fallsplat.se/bildbank/file/54666553438.pdfIn PDF document text
- http://otohondamientay.com/upload/files/rebuludavebuzaxe.pdfIn PDF document text
- http://www.badischer-kunstverein.de/ckfinder/userfiles/files/petudijovexolabex.pdfIn PDF document text
- https://alhasooncorp.com/Files/files/xaworuxotobuferapafivupuv.pdfIn PDF document text
- https://riondene.ch/img/uploads/file/visiboloxejijoboxufusiluz.pdfIn PDF document text
- http://rileyillustration.com/images/agency/files/sadanazogujovopupu.pdfIn PDF document text
- https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142ff86b7f33---madonovurimemobuwawosoti.pdfIn PDF document text
- https://sanaspinler.com/calisma2/files/uploads/29311189890.pdfIn PDF document text
- https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/74442862873.pdfIn PDF document text
- http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f28c6dc09---mudeketeruxa.pdfIn PDF document text
- http://nenorm.com/files/files/gufada.pdfIn PDF document text
- http://www.centralperdana.com/file/lijilapilewowavataxur.pdfIn PDF document text
- https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead02233c6---6252104733.pdfIn PDF document text
- http://sjhtractor.com/d/files/dazowanaravog.pdfIn PDF document text
- https://stillwaiting.org/userfiles/file/6015176119.pdfIn PDF document text
- http://rosabaum.de/web/editor/files/gotilogabo.pdfIn PDF document text
- http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/kizazazanelozidas.pdfIn PDF document text
- http://trungtamsangloc.vn/uploads/ck_upload/files/1707476533.pdfIn PDF document text
- http://birnagarcollege.in/userfiles/file/laminesivajovej.pdfIn PDF document text
- https://vhssirimpanam.org/ckfinder/userfiles/files/95134621111.pdfIn PDF document text
- http://pinzimoniofiumicino.eu/userfiles/files/42770017628.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_off0000bd8a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBD8A	16612 bytes
SHA-256: `603018840056e35c5c8c189eb3b55a63fd3a992f781e63ca7657ed49e0d702d0`
`font_01_sfnt_off0000e8a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8A7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000100be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100BE	10684 bytes
SHA-256: `2a0b4d7b9ff19446d4f6be2fbfd848021db85003b9f8f01a7b79bed0567c996b`

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