PDF malware analysis — malicious · e4c66dc850a95a2e

MALICIOUS

PDF

93.9 KB Created: 2021-08-08 01:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 8ee509667a7d928da0a2a4c79f7de8e9 SHA-1: bf7f59657e7f83523fe349f5ff81cc1001be31a3 SHA-256: e4c66dc850a95a2eccedc6460ace9b2d392bff960a854fe901a9c240f45142f0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution, aligning with a spearphishing attachment attack vector. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9932

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 https://huntic.ru/uplcv?utm_term=good+pizza+great+pizza+stewards+challenge+day+50 PDF link annotation
- https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/pfr34c7bh27lmhri4o926un6er/95323995095.pdfIn PDF document text
- http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609506953b04c---64105783127.pdfIn PDF document text
- http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/80enl7omm1anmk22nan1omnr63/negabifezapuzik.pdfIn PDF document text
- https://dubaimotorcycletours.com/uploaded_images/files/58256091638.pdfIn PDF document text
- http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/60252805222.pdfIn PDF document text
- https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a33c2f3ffc2---xexexuresifitazuruzete.pdfIn PDF document text
- http://meijialx.com/ckfinder/userfiles/files/korobofoxobin.pdfIn PDF document text
- http://toanthinh.vn/webroot/img/files/78314958428.pdfIn PDF document text
- https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c949e9e8ffa---boxepik.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c13ab3144672dee8e0bed18879a6ae31/23859867550.pdfIn PDF document text
- https://perfecthospital.net/FCKeditor/file/zeroluxalozoniji.pdfIn PDF document text
- http://podlahypilat.cz/admin/file/93120651532.pdfIn PDF document text
- http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/fonexesom.pdfIn PDF document text
- https://ottenburger.com/userfiles/file/bekenewulefabokit.pdfIn PDF document text
- http://totoquynhhuong.com/upload/files/5755427871.pdfIn PDF document text
- http://theofficefurniturestore.com/ckfinder/userfiles/files/dasalokikakelafelegunisox.pdfIn PDF document text
- https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/bf0e3f0a2d1b0752e5485eb6230f9deb/roruwirovekakuwetalop.pdfIn PDF document text
- http://southwest62.com/clients/6/66/666176aa584decdbf8d0f1e9213c5ee1/File/75463200692.pdfIn PDF document text
- https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/2713b22015ee91f45a48947fa865b990/44569010906.pdfIn PDF document text
- http://healthywithhart.com/res/file/minovupewivuwi.pdfIn PDF document text
- https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/11427215621.pdfIn PDF document text
- http://driver-jazda.pl/upload/file/81426167001.pdfIn PDF document text
- http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5772dce06---32781764804.pdfIn PDF document text
- http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3db2005df---movatozisenibuvoda.pdfIn PDF document text
- http://portalkucharski.pl/app/webroot/media/files/48560410087.pdfIn PDF document text
- https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/4e161e23d1d2151dbc616c28129e2cae/bagetebejipa.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_off0000ffcb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFCB	20252 bytes
SHA-256: `50209ae4810c8e30a053445a449c3a8a0fddb5b02d2510479c2a7bc74b2956a5`
`font_01_sfnt_off000133a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x133A0	11348 bytes
SHA-256: `236c76b1742a2113a9c28151b8b54fd9ca0e5a6d78da53094dc87282e994695c`
`font_02_sfnt_off00014e43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14E43	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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