PDF malware analysis — malicious · 54d7217efcfa8390

MALICIOUS

PDF

91.1 KB Created: 2021-09-13 09:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 9c58121c0d1909406e20f25a51514f26 SHA-1: 24d5df44de8b48c154194e35a0fb5206b0addb2c SHA-256: 54d7217efcfa8390499ace41574091cdc2d5959672dd544ffb222d5e52dbb0e1

112 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links pointing to compromised websites, suggesting an attempt to trick the user into downloading a malicious payload. The presence of a 'download button' heuristic further supports this attack pattern. The ML classifier strongly indicated maliciousness, and the linked URLs are associated with compromised CMS uploads and link farms, indicating a distribution mechanism for malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613044ea88a63---39794879033.pdf In PDF document text
- http://xn--oy2b19v1mb1yi.com/userfiles/file/12664983197.pdfIn PDF document text
- http://prepearl.com/uploadsfile/lonoporuxodizokepixu.pdfIn PDF document text
- http://logo4you.dk/userfiles/file/likadelogogudikajukil.pdfIn PDF document text
- http://dsfly.com/uploads/files/9186739932.pdfIn PDF document text
- http://www.anjhimayath.com/upload/file/46793697247.pdfIn PDF document text
- https://amatnieks.lv/pictures/image/6103224170.pdfIn PDF document text
- https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130cd9913271---gufivonabazutomu.pdfIn PDF document text
- http://le-lemniscus-incandescent.fr/ckeditor/upload/files/duduzikosurog.pdfIn PDF document text
- https://kenkochaya.com/user_data/ckfinder/files/42718410830.pdfIn PDF document text
- http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/90831048681.pdfIn PDF document text
- http://antasboru.com/guvennet/resimlerfiles/46326309039.pdfIn PDF document text
- http://abwva.com/uploads/files/sajotiwojerasawim.pdfIn PDF document text
- http://solar-makernavi.com/ckfinder/userfiles/files/18970508314.pdfIn PDF document text
- https://tiemhoamo.com/data/dulieu/files/27013772558.pdfIn PDF document text
- http://gd-weimi.com/upfolder/e/files/20210906185542.pdfIn PDF document text
- https://mdteam.se/ckfinder/userfiles/files/boxitovokulomisata.pdfIn PDF document text
- https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/43059271393.pdfIn PDF document text
- https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/91846115715.pdfIn PDF document text
- https://xulynuocphangiathinh.vn/images/pic/file/43380297321.pdfIn PDF document text
- https://www.algeos.com/js/ckfinder/userfiles/files/terujiwezuranusuduxev.pdfIn PDF document text
- http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137fca3483bf---6683437037.pdfIn PDF document text
- http://onfireinteriors.com/userfiles/ridevebulobakamagabedod.pdfIn PDF document text
- https://pt2-turbo-j3t.com/contents/files/53082675135.pdfIn PDF document text
- http://tootingtaxi.com/survey/userfiles/files/panopi.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fast+and+furious+9+online+putlockerPDF 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_off0000faee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAEE	19148 bytes
SHA-256: `f048939cfa3d1afa856dc1264357c5f0f4d42f5118598586997af4f4ebabfe4e`
`font_01_sfnt_off00012d11.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D11	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00014528.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14528	10948 bytes
SHA-256: `6eb127f491c270b2d840aed5dc2d37f5aa2b6f899135eb85d086ae0edd85edc7`

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