PDF malware analysis — malicious · b3544a502bcaee2f

MALICIOUS

PDF

85.3 KB Created: 2021-07-01 19:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: c319ea494d66af016df4cdc29c59a728 SHA-1: 06d26532a350bf0b7f731767103046e0bc8c0a09 SHA-256: b3544a502bcaee2fe083258584e94175b56ee27c93b6ed1fc5076494769a2e28

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to distribute malicious content or phish users. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

Heuristics 5

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 http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1942a063b---41626089621.pdf In PDF document text
- http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608455d135fbd---64630059382.pdfIn PDF document text
- http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa4aa7ee3---vigupomasuzegume.pdfIn PDF document text
- https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/025babca1971b62835787e23a78a79c2/78483759350.pdfIn PDF document text
- https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/eb4070b318c9c4ae047095d267241ba3/21426224220.pdfIn PDF document text
- http://cuuhoatudong.com/upload/files/ratolejubujidedaxezovajo.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc7a075ae9---jukowa.pdfIn PDF document text
- https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c06442d61f3---fijipolozonisokukoxitil.pdfIn PDF document text
- https://gencerenerji.com/resimler/files/vufuzuxusotitutupoj.pdfIn PDF document text
- https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7e39b1826e9dbadbdb25a7843b0ca322/48670131224.pdfIn PDF document text
- https://alshamiltrading.com/alshamilfiles/file/73680332073.pdfIn PDF document text
- http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a885bbcdb34---27550834613.pdfIn PDF document text
- https://gachbinhduong.com/upload/file/zumikoluruzozejud.pdfIn PDF document text
- http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ddcae43e1d6---6218793328.pdfIn PDF document text
- https://swagath.co/new/ckfinder/userfiles/files/judesifiwa.pdfIn PDF document text
- http://russkiivopros.com/images/FCKeditor/file/33866091191.pdfIn PDF document text
- https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/4251f69e5d7fcb40a259e446bc34c2d0/xipebogileseg.pdfIn PDF document text
- https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/abdladr8uou6l527pgh6n6dej0/72439915115.pdfIn PDF document text
- https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/2v2q6f8qcfdp8pgst6vvkua86r/9410773050.pdfIn PDF document text
- http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/4qimoqhbt175sjfopl4345o3l6/poxanafovusigubizuxu.pdfIn PDF document text
- https://alkalacarservice.com/public_html/userfiles/file/talozito.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/bcb9u8lc56naqulmvqdt96ekh2/69171674927.pdfIn PDF document text
- https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/cj1koj0481dpabd2327iid6r04/13294719201.pdfIn PDF document text
- https://sportsht.com/userfiles/file/36232903926.pdfIn PDF document text
- https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16097fee3bdecf---xesabizirewubova.pdfIn PDF document text
- https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a651aada408---83954704511.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pamphlet+examples+for+studentsPDF 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_off0000ea40.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA40	17008 bytes
SHA-256: `380f30b26e9ec6aaf995f835c04facf68dbd2d281aba61343b8084bd98116c4d`
`font_01_sfnt_off000116b8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116B8	10876 bytes
SHA-256: `013e06e73c577a2a6c3a6a75510704e03f9020dca53b9014245473a92b3374e4`
`font_02_sfnt_off00012fb4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12FB4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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