PDF malware analysis — malicious · 6e23307eae688dde

MALICIOUS

PDF

89.4 KB Created: 2021-09-05 05:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 4b702fcd6c9e06465aa7323127000675 SHA-1: 4910e1c39514c0d0e59203921064d03608ba1fa8 SHA-256: 6e23307eae688dde88f93308726416885cffc742c3ea054e062f4de67cd1fc42

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to initiate malicious actions within PDFs. It also exhibits characteristics of a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. These factors, combined with high ML and ClamAV detection scores, strongly indicate a malicious intent, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

Heuristics 7

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.
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.
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://pistant.ru/uplcv?utm_term=tipos+de+drogas+alucinogenas+pdf PDF link annotation
- https://www.sacict.or.th/ckfinder/userfiles/files/vudebeferolusakune.pdfIn PDF document text
- http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab32d644d19---43144274946.pdfIn PDF document text
- http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a341837d22a---79975029666.pdfIn PDF document text
- https://biomisszio.hu/tmp/6852665032.pdfIn PDF document text
- https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/2632de4f4306159af61a88699c039c3d/71495270626.pdfIn PDF document text
- https://thehouseconcert.com/ckfinder/userfiles/files/sopogubufiluzeku.pdfIn PDF document text
- http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f2a632338a1---83557662330.pdfIn PDF document text
- https://nnkcreations.com/userfiles/file/lutosewadidupipadiwotale.pdfIn PDF document text
- http://48bulls.com/js/upload/files/85693862113.pdfIn PDF document text
- http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16072e5724fa02---damikamegefepesi.pdfIn PDF document text
- https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607962a22a628---16937748901.pdfIn PDF document text
- http://driver-jazda.pl/upload/file/52441646777.pdfIn PDF document text
- http://navigator-nsk.ru/userfiles/file/86245468863.pdfIn PDF document text
- http://stigstudiotecnico.it/userfiles/files/lawagezudupewelar.pdfIn PDF document text
- http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083dabba82ca---35761925986.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612bfe1a607b7---dubula.pdfIn PDF document text
- http://ourdesign.hk/ckfinder/userfiles/files/daxivefujinewizuxofurol.pdfIn PDF document text
- http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78814643767.pdfIn PDF document text
- https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/9825227628.pdfIn PDF document text
- http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/xapizizowipokininoxovadin.pdfIn PDF document text
- http://koslita.eu/ckfinder/userfiles/files/5863095314.pdfIn PDF document text
- https://luminex.pl/upload/file/xanumoxewebapamenuposuzu.pdfIn PDF document text
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f87f39cd36---sekolomezibibulotow.pdfIn PDF document text
- https://tort-art.ru/userfiles/file/57950341739.pdfIn PDF document text
- https://cristalparkhotel.com.ve/ckfinder/userfiles/files/girumobuvekuke.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_off0000f700.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF700	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010f12.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F12	18988 bytes
SHA-256: `43bf26799c1112fc2900202e862520a4f97db0172814e2f2ea0b653e48f22deb`
`font_02_sfnt_off00013fa8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13FA8	10760 bytes
SHA-256: `eebf32f5826435693b4f35cf77172becbbff852e82b51bd557b543b2a0af4a63`

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