PDF malware analysis — malicious · a30805e6b42bae15

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 20:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: e2c266d0ee4cc77da0fbd30aec1b0bac SHA-1: 1f9b69c2e25a47a5dd0e2b59d57c025dc9592901 SHA-256: a30805e6b42bae15d804e1b9de24109091a5aeec33c029fd50decd2402e40f46

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially disposable hosting, suggesting an attempt to distribute further malicious content or phishing lures. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://crewmak.ru/uplcv?utm_term=l+blend+worksheets+for+kindergarten PDF link annotation
- https://stef-nancy.fr/upload/document/mubenoxitavaruxejinebelun.pdfIn PDF document text
- https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/32ef14dc1fd2d6558ff3a1c9448afc25/63140097744.pdfIn PDF document text
- http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e833c86e57---45178985022.pdfIn PDF document text
- http://phoiinnhiet.com/images/uploads/files/54604425673.pdfIn PDF document text
- http://kripasec.com/userfiles/file/jelerigelopusesa.pdfIn PDF document text
- http://eros-arena-reutlingen.de/eros/userfiles/file/nofukenuditoviwalojafe.pdfIn PDF document text
- https://mbzgogo.xyz/web/img/podborky/files/37128864060.pdfIn PDF document text
- https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lodelejojiwi.pdfIn PDF document text
- https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a79bdc791---piluneraforaxa.pdfIn PDF document text
- http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161075b798381d---28479997334.pdfIn PDF document text
- http://girisimcilikproje.com/resimler/files/lixipirebipuxizukovepumoj.pdfIn PDF document text
- https://oncallanatomist.com/ckfinder/userfiles/files/30541481611.pdfIn PDF document text
- https://discovery99.com/userfiles/file/30589642792.pdfIn PDF document text
- http://architettoletiziamasciotta.eu/userfiles/files/berewiwagagofotojanobiwak.pdfIn PDF document text
- http://moestuinwebshop.nl/userfiles/file/zesunebobajovex.pdfIn PDF document text
- http://fantalife.nl/userfiles/file/xujuwijibe.pdfIn PDF document text
- https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d6bfed6947a7cb3524f5f17917a72493/2187137673.pdfIn PDF document text
- https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09e4c1bade---86287094019.pdfIn PDF document text
- https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/9394c6b6e76ea8e592cafa339d8032c8/66613179555.pdfIn PDF document text
- https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/07e6a1fec37112bd5abb1bcbe396fede/jevojavixomepebupafudase.pdfIn PDF document text
- https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b0564fe673b0d7217843a845d11573ca/pupav.pdfIn PDF document text
- https://drticket.ir/basefile/drtiketcom/files/tuwetaruduvenosaduxuko.pdfIn PDF document text
- http://sportingclubalbinia.eu/userfiles/files/74739557711.pdfIn PDF document text
- https://roshnaai.com/ckfinder/userfiles/files/46978118547.pdfIn PDF document text
- https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160e4db1380e72---nozaxafeluduwuwem.pdfIn PDF document text
- https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/92522e35d6d3a260359554ed2c595eab/kamupojamebatusejebu.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_off0000e7eb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7EB	10908 bytes
SHA-256: `533d8f3e3754dec18a6d59bd0a2f685ff88eefdb1eea53b468d8ecf2361a26dd`
`font_01_sfnt_off000100f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100F0	18724 bytes
SHA-256: `d511136d9969676e15cffc63bfabb47176c69555227a4895ac7933cbdf366658`
`font_02_sfnt_off00013111.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13111	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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