PDF malware analysis — malicious · dad9d258f6906d81

MALICIOUS

PDF

91.0 KB Created: 2021-08-09 21:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 7252b4b712831c14dfa8527cba10fd08 SHA-1: 757c29d004dd2c786d47923d24df420f67611c3e SHA-256: dad9d258f6906d81fab65978d71518e9f09c3a24164c616832c5b6ce33ec005e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm directing users to numerous URLs, several of which are hosted on compromised WordPress sites or disposable domains. The presence of these links suggests an attempt to lure users to malicious websites for phishing or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9945

Heuristics 6

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.
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=ejercicios+de+division+de+fracciones+mixtas+resueltos PDF link annotation
- http://porpora.biz/imagenes/imagenes_contenidos///14720686643.pdfIn PDF document text
- https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/98192524421.pdfIn PDF document text
- https://diedacorporation.net/freesiafiles/file/94859493065.pdfIn PDF document text
- https://baohohoanglong.com/userfiles/file/29831937825.pdfIn PDF document text
- http://svb-volleyball.de/userfiles/file/tusazizabevexojepowi.pdfIn PDF document text
- http://ergo-logo-bamberg.de/userfiles/file/xufagexebivafigomirebeki.pdfIn PDF document text
- https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dfaa56824---5874517039.pdfIn PDF document text
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ba4e8daf0---fapudamuwajovejolegod.pdfIn PDF document text
- https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/47165c7099254b2e1bb655b567c24fcf/29796827100.pdfIn PDF document text
- https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/639de107ec4c618be820659f21302e23/fuxudifulujusa.pdfIn PDF document text
- http://ventexevent.se/uploads/file/kukapesiw.pdfIn PDF document text
- http://goldmustang.ru/files/files/3531416400.pdfIn PDF document text
- https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b381a721188---4951109705.pdfIn PDF document text
- https://burkina-businessschool.com/business_school/uploads/file/lazovimot.pdfIn PDF document text
- http://vienkiemis.lt/app/webroot/uploads/userfiles/files/77310236910.pdfIn PDF document text
- http://jcbcharpentebois.com/ressource/site-image/files/wudumo.pdfIn PDF document text
- https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60b7503db8---6024651340.pdfIn PDF document text
- http://interel-rus.ru/test/sites/default/files/file/97313180229.pdfIn PDF document text
- http://americansemitruckparts.com/d/files/bivuxolafawexiso.pdfIn PDF document text
- https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/55d36fce3f6cff9c02a4d0630e36d155/mipekojibigit.pdfIn PDF document text
- http://stalmost.pl/userfiles/file/dukaziluwopa.pdfIn PDF document text
- http://brightwayconsultancyservices.com/userfiles/file/resozejudaj.pdfIn PDF document text
- https://carcable-bg.com/uploads/pictures/files/fovemudekubojibo.pdfIn PDF document text
- http://alt-1c.ru/userfiles/file/rikofirezeligason.pdfIn PDF document text
- http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a0548461d---65803959673.pdfIn PDF document text
- http://aarogyamedico.com/userfiles/file/65300190397.pdfIn PDF document text
- https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2033447d4a---67943300595.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_off0000fc73.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC73	11020 bytes
SHA-256: `90f3b5169fa30136b89168e4c5898ddc7d7a267a67be90cc8f327035579f0139`
`font_01_sfnt_off0001160d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1160D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012e1f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E1F	17968 bytes
SHA-256: `0f195efb97615bd3b9f51d59e4f7532d87482b401e007c5d55c4bc1a89541c83`

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