PDF malware analysis — malicious · b1267197bce6973b

MALICIOUS

PDF

75.8 KB Created: 2021-09-23 20:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 0903b5b8deffc0dd511f9789b1260c18 SHA-1: 70d631059d51969033e5301ff45e9149c66e78c3 SHA-256: b1267197bce6973bad628b4391442468d24e832d30318b5dd31185be2990da51

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests a social-engineering attack aiming to trick the user into installing malicious software disguised as a browser update or extension. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, likely serve as download locations for secondary payloads or phishing pages.

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
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
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://oniceh.ru/uplcv?utm_term=installer+android+system+webview PDF link annotation
- http://salt17.com/userfiles/files/jirupofokor.pdfIn PDF document text
- http://xageunion.com/userfiles/file/mamofawutotadato.pdfIn PDF document text
- http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90131816457.pdfIn PDF document text
- https://hkpefa.org/editor_upload/file/wexefivukek.pdfIn PDF document text
- http://koddous.com/userfiles/file/fikowijagim.pdfIn PDF document text
- https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/87911285317.pdfIn PDF document text
- https://moderator.lt/components/com_mijoshop/opencart/image/data/files/poxenenadixozikexu.pdfIn PDF document text
- https://ww150006.linebot.net/upfile/files/20210914120944.pdfIn PDF document text
- https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7c21e606---93106231913.pdfIn PDF document text
- http://vuatoyen.com/uploads/userfiles/file/6936321309.pdfIn PDF document text
- http://lionsmarsala.it/userfiles/files/6243850145.pdfIn PDF document text
- http://imhang.com/fckeditor/userfiles/image/92420099162.pdfIn PDF document text
- https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/94025f1cadf8614baaeaf099cd2e7853/16167617758.pdfIn PDF document text
- http://adria-ex.com/images/blog/file/mowepukudem.pdfIn PDF document text
- http://imdmotors.com/uploadfile/file/2021091009364646.pdfIn PDF document text
- http://getrade.net/uploadfiles/file/26869581815.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd879f19c---dosesumede.pdfIn PDF document text
- http://koreanhotpot.com/uploads/files/7218374209.pdfIn PDF document text
- http://www.fonfe.com/uploads/files/kunimixo.pdfIn PDF document text
- http://fratellilongoni.com/userfiles/files/72986283601.pdfIn PDF document text
- http://lawngo.net/fckfiles/61611178475.pdfIn PDF document text
- http://re-media.ru/foto/ck/files/46450070645.pdfIn PDF document text
- https://idd.no/ckfinder/userfiles/files/mowixonamiwotubiz.pdfIn PDF document text
- http://videocycling.info/files/file/fekiwajabosowusize.pdfIn PDF document text
- http://kes.org/upload/editor/files/paduxegewanin.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_off0000c228.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC228	10768 bytes
SHA-256: `da916748d04ab5c0cff2553b68352530aeda1bc3c33f12ebca62e7664a4c9794`
`font_01_sfnt_off0000dafa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAFA	18056 bytes
SHA-256: `5703261f618c02f89ef85e3f8ce731466e2ed259a70ce7811870bab1f325bdde`
`font_02_sfnt_off0001095b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1095B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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