PDF malware analysis — malicious · 105a6d033872bd5d

MALICIOUS

PDF

87.6 KB Created: 2021-08-02 22:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: d4e234340d2540b49eabe6d0128f4b43 SHA-1: c69d180fa9f24f92823816292e9944cfc37a8f9e SHA-256: 105a6d033872bd5d2144d2fe0a63df1a084f6ea78d80621f6b51da2038c7bbf7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content. The presence of multiple links on disposable hosting further supports this. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

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://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0cd77515b---vinokixibowilabiwijosuxa.pdf In PDF document text
- https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/ceea4eeafaf79a776095672a8850fc62/rovususexeza.pdfIn PDF document text
- https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609690fc2139e---poruzowibomozer.pdfIn PDF document text
- http://ninfahartman.com/clients/d/d5/d5ac6782717b6a1c58177985440d8e57/File/4972544853.pdfIn PDF document text
- http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/3152a6f6a1a3f1933c7fe0f628519692/lonefuxulafewoxekud.pdfIn PDF document text
- https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/3a01cb6373fb6ec641d089d4f4d706cb/2101311753.pdfIn PDF document text
- https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/2f38691eefb63eaeda62b1efe1d05741/67374599941.pdfIn PDF document text
- https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/cf91183a70dd435c3242f592df25e32d/vogegalivenanoxiragitefag.pdfIn PDF document text
- http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/17e51faaf29458627dfe5e18d6752846/zofaberonarowasofajoja.pdfIn PDF document text
- http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/roseko.pdfIn PDF document text
- http://www.cenlajobinator.com/siteuploads/editorimg/file/31961315137.pdfIn PDF document text
- http://chokmanee.com/userfiles/file/81840891585.pdfIn PDF document text
- https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/894c7ef1bc365a3d08af4cc71f425ba1/zubinene.pdfIn PDF document text
- http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca68f97bf5---95147355219.pdfIn PDF document text
- http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b855710d7---66586836317.pdfIn PDF document text
- https://angkoronetour.com/userfiles/file/zasukejerujugotifuraw.pdfIn PDF document text
- https://kclandscapes.com/ckfinder/triplebuserfiles/file/5026747724.pdfIn PDF document text
- https://vvpta-irvine.org/userfiles/file/9869075262.pdfIn PDF document text
- https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073aa6c08fa9---zakikona.pdfIn PDF document text
- https://muzeumkonstancina.pl/attachments/file/2673749071.pdfIn PDF document text
- http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608778793ac0c---94617213943.pdfIn PDF document text
- http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608db9402d544---linipebapumudifil.pdfIn PDF document text
- http://www.allatpatikapecs.hu/images/file/sevojavuzisojedeje.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=google+earth+flight+simulator+planesPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e882.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE882	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010094.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10094	17560 bytes
SHA-256: `ddb4f9753b93ba12a732ba404805463095829fcebfb09b39bd6289847ad455d7`
`font_02_sfnt_off00012e42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E42	10944 bytes
SHA-256: `80849766bc1ad4d12edc87651b9654ce2fb6bc9d0b770a4576c7fc1355ce9336`
`font_03_sfnt_off00014778.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14778	1700 bytes
SHA-256: `15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8`

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