PDF malware analysis — malicious · 40f5356338a7d3a7

MALICIOUS

PDF

89.4 KB Created: 2021-09-19 09:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: f0adab4448f40d830744ea90d6943675 SHA-1: aa296180455db23b47b0abaec3e33f4b112b2d70 SHA-256: 40f5356338a7d3a71678fa4ee3470168a07a0e7ee56aab77e04bd68b1ae03fdb

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack. The numerous URLs suggest an attempt to obscure the final malicious destination and evade detection.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=two+headed+serpent+cthulhu+pdf PDF link annotation
- https://gameadvisers.com/js/new/fckeditor/userfiles/file/sakeveneramuwopase.pdfIn PDF document text
- http://poliambulatorioargentina.eu/userfiles/files/wirezid.pdfIn PDF document text
- https://abhimaninteriors.com/ckfinder/userfiles/files/73862901176.pdfIn PDF document text
- http://biosafety.biz/ckfinder/userfiles/files/nogizaniwetunib.pdfIn PDF document text
- http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613932120e4e3---vumigivotigadukalaturuxu.pdfIn PDF document text
- http://encino.ilovepokebar.com/uploads/files/vezenipunufujefunadimivul.pdfIn PDF document text
- http://bakefruit.com/uploads/files/202109172002091045.pdfIn PDF document text
- https://mimpishiosatu.com/contents/files/89147130354.pdfIn PDF document text
- http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613300a93465e---13276069402.pdfIn PDF document text
- http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/68536119705.pdfIn PDF document text
- https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/eseivf914qtvr47q7r544s3c57/52329610476.pdfIn PDF document text
- http://yummyschool.com/_UploadFile/Images/file/vexobuxopalunebagu.pdfIn PDF document text
- http://stefani.cz/fck/file/45943916688.pdfIn PDF document text
- https://johanbjerke.se/userfiles/file/gelokisule.pdfIn PDF document text
- http://phuketdriveschool.com/userfiles/file/40545144293.pdfIn PDF document text
- https://nenmongdangquang.com/upload/files/28621720505.pdfIn PDF document text
- https://www.informacion-indoorclub.com/boletines/img/file/689422999.pdfIn PDF document text
- https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/231f68029cbb79f8c798ecdfd7fcd5a8/xuzebano.pdfIn PDF document text
- http://labonscafe.com/userfiles/34362693200.pdfIn PDF document text
- http://tunesistudio.eu/userfiles/files/11009131668.pdfIn PDF document text
- http://vektor-bezpeki.com/userfiles/files/86185297102.pdfIn PDF document text
- https://kmedebiyatgunleri.com/ckfinder/userfiles/files/wifazonokelula.pdfIn PDF document text
- http://confidenzacsapagy.hu/upload/naxizukapusag.pdfIn PDF document text
- http://saraswatishikshamandir.com/singhania/downloads/file/1603355912.pdfIn PDF document text
- https://ktmcollege.org/public_html/userfiles/file/zajezomamojo.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_off0000f7ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7ED	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010fff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FFF	18096 bytes
SHA-256: `986d7b07cc7b9f65d129d02fc44b2f1e14fbf5db4f6a571ae2176abe9e592f8d`
`font_02_sfnt_off00013eb0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13EB0	10776 bytes
SHA-256: `0a9c215195a591def05e4b0dd0bd3ff41304a17dc5630dbb79fbf0abfa9512e9`

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