PDF malware analysis — malicious · c5e2345f364306ea

MALICIOUS

PDF

109.3 KB Created: 2021-07-07 11:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 0dc12f5e2009ef28da64f5d6ee4d8a3d SHA-1: 2ad388c84661c216753d373e6f2d341fe72e1d9d SHA-256: c5e2345f364306ea5caad770e9d800f10b763d4ff680b541f6baf7a7b566ea11

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9960

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://chcial.ru/uplcv?utm_term=literature+and+society PDF link annotation
- http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/7ibr8nnbrvhme4c9urinc9vaf0/52856769956.pdfIn PDF document text
- http://imreelectric.sk/uploads/file/minov.pdfIn PDF document text
- https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c62dbaae441---mopexanor.pdfIn PDF document text
- http://dakmet.pl/upload/zesuluvetegitapujuka.pdfIn PDF document text
- https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ee9c781a3305afa1adc024dc441748de/22868015832.pdfIn PDF document text
- http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce69d6f32---99576517606.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f3c77422164ac1d067fd4851d7442619/jiweziditibofu.pdfIn PDF document text
- https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f8cd5c768---96183274524.pdfIn PDF document text
- http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/dewitezibof.pdfIn PDF document text
- https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/k0gquouchvadrg156q2oqpovdq/jitobaxizegezuguletunawiw.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/7db3717f34067e5078ab071663b10778/71224348739.pdfIn PDF document text
- http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609197847d5ef---91704681472.pdfIn PDF document text
- http://hotelstrack.com/bot/ckfinder/uf/files/zuwiwedutapumizafuw.pdfIn PDF document text
- http://ck-kutnahora.cz/gais/image/file/35452582107.pdfIn PDF document text
- http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc29c8c44d---38243504320.pdfIn PDF document text
- https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/f45t5bojlunldoa28tbapighsq/83288033058.pdfIn PDF document text
- https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d97325f7b0dc6312ff9ddcd40ceeff4d/ximutuwo.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ea4092f7f---pasuxetafelareki.pdfIn PDF document text
- http://www.firengo.com/userfiles/files/sapikujarop.pdfIn PDF document text
- http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab15fda670c---52101795821.pdfIn PDF document text
- https://arerp.kr/data/file///14380817269.pdfIn PDF document text
- http://urbanconstructions.org/images/uploadedimages/file/wumarokafowawugobawavo.pdfIn PDF document text
- http://msiutilities.biz/documents/74806224677.pdfIn PDF document text
- http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607822cb89cfc---86533994663.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_off00014954.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14954	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001616b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1616B	10488 bytes
SHA-256: `b15d47b639da6ad623aaf83cbd6252a5d20f9c6f0af39cf6f5d42d8781a70319`
`font_02_sfnt_off00017968.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17968	18168 bytes
SHA-256: `e8fe29476f454bb356d289c0f63ced2adcb280afba31da85361977955582ab32`

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