PDF malware analysis — malicious · 9a6068cac80b0964

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 00:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 9335599e72f3c9946d5d38759bdfb192 SHA-1: 04393e26291884169aea80c4395a98e779d56547 SHA-256: 9a6068cac80b0964044ef9e58fd8b60426da011504b3d51150ee3f33d2560c49

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs and link farm heuristics, suggesting it is designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further supports this. No scripts were extracted, but the overall structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=free+coins+zombs+royale PDF link annotation
- https://markaoyun.com/calisma2/files/uploads/38142551808.pdfIn PDF document text
- https://vcubusinesssolutions.com/userfiles/file/23575816375.pdfIn PDF document text
- http://edu-soft.ru/site/htmlimages/file/62927669419.pdfIn PDF document text
- http://qapoll.com/2015/vat/upload/files/88291745993.pdfIn PDF document text
- http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/87215844560.pdfIn PDF document text
- http://benevolo.it/userfiles/files/40606375706.pdfIn PDF document text
- http://saigondome.com/uploads/userfiles/file/87209399697.pdfIn PDF document text
- http://state-lithium.com/upload/files/kibimuvotogil.pdfIn PDF document text
- https://sthouseluxury.com/upload/files/rurivivixarugufeve.pdfIn PDF document text
- http://orthodoxvaidikasanghom.org/userfiles/file/jakizibeji.pdfIn PDF document text
- http://iswii.net/ckfinder/userfiles/files/31289057334.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6e4311f4e---89403317128.pdfIn PDF document text
- http://enjoyisagenix.com/ckfinder/userfiles/files/wixetejozofa.pdfIn PDF document text
- https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/378b9f7902098f46db16aa93fa9d1291/26024602124.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0253ef3ef225a83fd06409e1d6e9dfa2/kiwajenefodajodonuwonu.pdfIn PDF document text
- http://vnos.vn/app/webroot/uploads/files/30008107458.pdfIn PDF document text
- https://history.tlshaa.org.tw/ckfinder/userfiles/files/90990728544.pdfIn PDF document text
- http://orderleesushi.com/uploads/files/fomopa.pdfIn PDF document text
- http://swhos.com/upload/files/60047696615.pdfIn PDF document text
- http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/dirugiro.pdfIn PDF document text
- https://www.netcorp.hu/data/editorfile/28232470462.pdfIn PDF document text
- https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132be79d6adb---79230302410.pdfIn PDF document text
- http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bidaduperirufefu.pdfIn PDF document text
- https://tvsporedi.si/vsebina/womasegakigarudemu.pdfIn PDF document text
- http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf3e7e6158---89608559707.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_off0000d95d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD95D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f174.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF174	10584 bytes
SHA-256: `fc0ef074641c6aeb9c91c7479a642b73ee81266e33dea364a4f687f12582d128`
`font_02_sfnt_off000109a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109A2	18284 bytes
SHA-256: `68b9cb9a0d2681888edfbfaac5b04a9817d0e78d4e2505d189048b97b3c2ad72`

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