PDF malware analysis — malicious · 3ff0b6b371d8796c

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 02:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 58c59b5ce65088c6732b8d3fb2f11e8d SHA-1: 42f65ae17f1f0460702ea8b4fdceea53255a4497 SHA-256: 3ff0b6b371d8796cfd8dbbb12efd9df52dd79d54f21a53f1ddfe4bc97842c3b5

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm or phishing lure. ClamAV detection and ML classification strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

Heuristics 7

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.
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://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/f4298a3ebc0fb19061e1e5ab5d3e3e23/43915503271.pdf In PDF document text
- http://impressivetravelvietnam.com/upload/files/59085920634.pdfIn PDF document text
- https://ambalatender.com/upload/files/tigejuzojebilog.pdfIn PDF document text
- http://isvpro.com/custom/files/koxumosipowoditima.pdfIn PDF document text
- http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/nowakapelikopusukewurew.pdfIn PDF document text
- http://zabradli-znerezu.cz/userfiles/file/fonosibuwalab.pdfIn PDF document text
- http://myconnect-thailand.com/image/upload/File/gorunivipub.pdfIn PDF document text
- http://carbonelite.ru/file/marupukemosivujonek.pdfIn PDF document text
- http://efuturesthai.com/uploads/file/nuxofutefedubazijigevod.pdfIn PDF document text
- http://fuyu.010bi.com/ckfinder/userfiles/files/88515142907.pdfIn PDF document text
- https://marblobaths.ph/app/webroot/img/files/44602474805.pdfIn PDF document text
- https://fallahi-sch.com/userfiles/file/kobomiso.pdfIn PDF document text
- https://libertyrealestate.in/ckfinder/userfiles/files/8619853760.pdfIn PDF document text
- http://ueros.fr/admin/ckfinder/userfiles/files/61044460129.pdfIn PDF document text
- http://khacvietlaser.vn/public/images_news/files/kemagugakiguginasuzoj.pdfIn PDF document text
- http://smartvoicecom.com/userfiles/78257828034.pdfIn PDF document text
- http://rem-proekt.com/f/file/wakafab.pdfIn PDF document text
- https://hostsolutions.ro/app/webroot/files/userfiles/files/serakavexuka.pdfIn PDF document text
- http://accessiblevehicleservices.com/userfiles/file/19511589399.pdfIn PDF document text
- http://technoauto.jp/js/upload/files/jisugerixile.pdfIn PDF document text
- https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614196ebcc5dc---5426045298.pdfIn PDF document text
- https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/53pt0iruchb8h62v4hvcpsene1/pufoketitugidezexalexej.pdfIn PDF document text
- http://yogaschoolofkerala.com/photos/editor/files/pibunulexovewir.pdfIn PDF document text
- http://panda-es.tokyo/yamituki-n/uploads/files/numodowarudedi.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=subway+surfers+game+mod+apkPDF 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_off0000cf9d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF9D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e7b4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7B4	11108 bytes
SHA-256: `76d2f19922f395c3ab2a8ac3f025535567458d71435611d63c3bfb5b83e9149c`
`font_02_sfnt_off00010153.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10153	22224 bytes
SHA-256: `2582bd12df8f494c6fa5fa5a04184c3d8a747fd9f4c379ff7c7ed444b1b65d3b`

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