PDF malware analysis — malicious · 28180c17eb8ec95e

MALICIOUS

PDF

70.7 KB Created: 2021-10-10 00:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: d9155d8855dbf6b4fb34ddb2c96afebe SHA-1: a102d3f1653cb0f48dfe3c153b6defda44d45c25 SHA-256: 28180c17eb8ec95ec1badef004f7aefabbf925f845ab59d88965d1476fa6df11

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The embedded JavaScript and numerous external URIs, many hosted on compromised or disposable domains, suggest an attempt to redirect users to malicious content or phishing sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed for SEO manipulation or traffic redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=nonlinear+differential+equation PDF link annotation
- http://podiummoda.ru/userfiles/file/zinaxelixesixepowarosajog.pdfIn PDF document text
- https://vieclamlaocai.vn/webroot/img/files/gigegadexuzixabozumadilo.pdfIn PDF document text
- https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/12633c0ca22ce7fe4faa3cd96f6bf871/supefapa.pdfIn PDF document text
- https://iuoshili.com/upload/users/files/wurax.pdfIn PDF document text
- http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e521605ad6---kudefewumekesasonuzup.pdfIn PDF document text
- http://nhasachconggiao.com/luutru/files/puxegi.pdfIn PDF document text
- http://ukrfirework.com/images/file/fuwujaxuvijipawidewoxo.pdfIn PDF document text
- http://lechioutdoor.com/userfiles/file/xaxafowuxufezuvunovix.pdfIn PDF document text
- http://cold.lt/userfiles/file/rojagunegutomiga.pdfIn PDF document text
- https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/4c89cd497af57c04e4569e54ab7a2faf/49061947100.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614863d2f06e8---jubafumolito.pdfIn PDF document text
- https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/doe0if7c4fnir6o0s8s5itke5c/daponilifelud.pdfIn PDF document text
- http://xn--h1agcmh.com/ckfinder/userfiles/files/susiroxarikibem.pdfIn PDF document text
- https://samsunyapi.com/userfiles/files/wipamunetegakaferulaseluf.pdfIn PDF document text
- https://baxsporthorses.com/userfiles/file/fakunegifevigovorolovaje.pdfIn PDF document text
- http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/61396608514.pdfIn PDF document text
- https://hebatkeren88.com/contents/files/85682249265.pdfIn PDF document text
- https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/tizusapibisabetu.pdfIn PDF document text
- http://nanopena.cz/upload/file/jorinuxowutosuxuwoli.pdfIn PDF document text
- https://goldengatetaichiqigong.com/userfiles/file/wamunoxolokagasu.pdfIn PDF document text
- http://kaztelcom.kz/ckfinder/userfiles/files/vexudajifesanaja.pdfIn PDF document text
- https://phukienbep.net/media/files/nibowoveliduse.pdfIn PDF document text
- http://artbaget.net/admin/ckfinder/userfiles/files/liparofene.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_off0000b3c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB3C5	16196 bytes
SHA-256: `4cf4257c8b37503eb35094467fc0e7e6b7bb8a3968dd73d81809b8fdb756670d`
`font_01_sfnt_off0000de08.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE08	10400 bytes
SHA-256: `fbad5e0bc783dc1f10fec3b2630add379f5a636f282a83237efe75f5e4b8ae03`
`font_02_sfnt_off0000f570.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF570	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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