PDF malware analysis — malicious · 629b421cdd853e96

MALICIOUS

PDF

71.7 KB Created: 2021-09-10 03:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 98c384af317b409147bba9d4a33cb2ee SHA-1: 50067203a73ce6ffa6dc006dfa52184287bf7d14 SHA-256: 629b421cdd853e96068bff0dc3acb63760fcc6af2d779d9e7ef8cce751b3b792

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 ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or malware distribution, rather than containing executable content within the PDF itself.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://smolensk-bakaleya.ru/userfiles/file/tidijulutojokalimenebaxuf.pdf In PDF document text
- http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4819c9727---xibalolitev.pdfIn PDF document text
- https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/fijixowopesifapaz.pdfIn PDF document text
- http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393dae10fbf---6662553911.pdfIn PDF document text
- http://ppfi-online.com/userfiles/file/dulinopunebigejupox.pdfIn PDF document text
- http://tecs4.com/intranet/ckfinder/userfiles/files/65809147122.pdfIn PDF document text
- https://mallorcaboom.com/res/wysiwyg/file/laruruxufugomiribiru.pdfIn PDF document text
- http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zalinuvuwurenidezatizi.pdfIn PDF document text
- http://cesvil.it/filesUploads/file/8172610995.pdfIn PDF document text
- http://ipllaser.in/uploads/34446994013.pdfIn PDF document text
- http://shanghaiqingchen.com/upload/files/rewimuligofifuvopimonu.pdfIn PDF document text
- https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/61fcae9cb35c47e2ef0a9342ef1aeffa/61115026171.pdfIn PDF document text
- https://trompis-tondschungel.de/userfiles/file/wipidadijiziz.pdfIn PDF document text
- http://uitetenindex.nl/images/uploads/93652704691.pdfIn PDF document text
- http://lukinserv.hu/file/57180636461.pdfIn PDF document text
- http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c835a3bfa---ladepekugekij.pdfIn PDF document text
- http://www.clc-engineering.com/siteuploads/editorimg/file/vipaziwufimuf.pdfIn PDF document text
- https://ecoverservice.be/gallery/file/88187299794.pdfIn PDF document text
- http://uhy-th.com/image/upload/files/romaberur.pdfIn PDF document text
- https://perfecthospitals.org/ckfinder/userfiles/files/nusotaru.pdfIn PDF document text
- http://lyzjkgm.com/d/files/7577856820.pdfIn PDF document text
- http://marymo.ru/uploads/files/jajavegulitafaf.pdfIn PDF document text
- http://psychologkmalinowska.pl/ckfinder/userfiles/files/bipefen.pdfIn PDF document text
- https://dollarplus98.com/images/upload/files/nagigenatiz.pdfIn PDF document text
- http://les-dvorik.ru/userfiles/file/51487983325.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+change+android+os+in+mobilePDF 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_off0000b88f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB88F	11032 bytes
SHA-256: `9c81e6f150f3f40432a14a92d65c22bf9aa94d38ec736fe3a799965f9fc3afeb`
`font_01_sfnt_off0000d1d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD1D6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e9e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9E8	15572 bytes
SHA-256: `6d00f2840f28a623e8714e4a4fb629a2a6000cbc9167c7d2d4db2d0445b5f74f`

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