PDF malware analysis — malicious · 7df39e0a1ee99bd0

MALICIOUS

PDF

83.3 KB Created: 2021-09-12 01:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 4bf5874168a0edcd97468564ed3e798a SHA-1: 785168d050af7fc8022401a8e3060ff149fb4bdb SHA-256: 7df39e0a1ee99bd059447081f3d21c62086c633463061e3e7f5ab39c441e5755

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Several heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://rallstarawards.us/nbloom/fckuploads/file/pudak.pdf In PDF document text
- http://mwflower.com/upimagesfile///16836667671.pdfIn PDF document text
- https://salvamontbihor.ro/app/webroot/files/userfiles/files/vunob.pdfIn PDF document text
- https://bd-sokolovska.eu/userfiles/file/48276192231.pdfIn PDF document text
- http://bloodfaces.de/attachment/file/bamovoti.pdfIn PDF document text
- https://aiwcecckolkata.org/FCKeditor/file/wakadelelenedekuz.pdfIn PDF document text
- https://terracetemayonetim.com/upload/ckfinder/files/fowetirataridasozekizawi.pdfIn PDF document text
- http://incomingmakedonia.com/files/files/5311789975.pdfIn PDF document text
- http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec6c3c980---digebegibaxojujipozudexer.pdfIn PDF document text
- http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161354895c88cc---ravawepa.pdfIn PDF document text
- http://motivationandmomentum.net/ci/userfiles/files/36762909767.pdfIn PDF document text
- https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/04dd6ad910814eec00ac300480eed0ba/51429395695.pdfIn PDF document text
- https://dafelia.com/files/sinupudisuxopiwozaziz.pdfIn PDF document text
- https://onutglen.com/caningest/images/file/31087227412.pdfIn PDF document text
- https://demetraproject.eu/ckfinder/userfiles/files/dizejulesebape.pdfIn PDF document text
- http://coeb.eu/userfiles/files/xakefajafufufuratu.pdfIn PDF document text
- https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd03e17ed6---55624351140.pdfIn PDF document text
- https://remini.hu/userfiles/file/73769129644.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=javascript+best+book+pdfPDF 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_off0000ddb6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDB6	10752 bytes
SHA-256: `a63830dab603a74eb77d4703671a413a68207b2f9c2a328b2ea8061c3cba5dfc`
`font_01_sfnt_off0000f667.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF667	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010e79.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E79	19216 bytes
SHA-256: `2d2f1be71762ad3d0963dd9d842aa42317060af5f35c21aaf018eba6c2699e87`

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