PDF malware analysis — malicious · 88421d980d573c33

MALICIOUS

PDF

75.3 KB Created: 2021-09-25 17:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: fd8d7d9975ac1e803df1cfe52dc63c5a SHA-1: 590c39875afc820759da61a0d8a7862b0f0583da SHA-256: 88421d980d573c33d947ca2b855936f536124e9ebcd3d0f46b30bd8f1d04db9c

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://chcial.ru/uplcv?utm_term=best+kodi+build+for+movies+2021 PDF link annotation
- https://airxps.com/userfiles/files/85664621459.pdfIn PDF document text
- http://asirakademi.com/resimler/files/zepedoluximexin.pdfIn PDF document text
- https://queensflower.nl/clientfiles/ragidavopuxutudowi.pdfIn PDF document text
- https://camgloberealtor.com/userfiles/file/18571970223.pdfIn PDF document text
- http://airelimpio.mx/img/editor/file/losalebekifexekubedetadow.pdfIn PDF document text
- https://ntpuvoice.com/ckfinder/userfiles/files/60127880138.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/34da2c0ab930f2985b626d074d900b62/zupamexenol.pdfIn PDF document text
- http://ddaengshop.com/ckupload/files/97293530784.pdfIn PDF document text
- http://abbuffalowings.com/uploads/files/vozaroribepalikatatumuw.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137658b4c185---29332137306.pdfIn PDF document text
- https://holcom-solar.com/webroot/img/files/23597500284.pdfIn PDF document text
- http://kyea.org/imageuploads/50486725474.pdfIn PDF document text
- http://hurtmar.pl/Upload/file/rimab.pdfIn PDF document text
- http://diadiemvui.com/upload/files/zagakudixejetuj.pdfIn PDF document text
- https://stka.gr/ckfinder/userfiles/files/47654956353.pdfIn PDF document text
- https://pavillonwohlen.ch/userfiles/files/lafapenunowutatoguzumat.pdfIn PDF document text
- http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161307a3a358e8---71210703208.pdfIn PDF document text
- http://car-zone.sk/data/data/file/2986841267.pdfIn PDF document text
- https://bodegoncriollo.com/userfiles/file/47184938525.pdfIn PDF document text
- http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb46f0cfe3---61997196799.pdfIn PDF document text
- https://kohphanganhotelandtour.com/userfiles/file/gazevedefijovuvaxelaneso.pdfIn PDF document text
- http://nadiadsa.org/userfiles/file/zubutodixusupiliv.pdfIn PDF document text
- http://www.llmhospital.com/www/js/ckfinder/userfiles/files/34316324045.pdfIn PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9ff6e01b01ea19381dba043acbffb747/77146537422.pdfIn PDF document text
- http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/47497790019.pdfIn PDF document text
- https://hyundainhapkhau.vn/upload/files/74645129559.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_off0000bd2e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBD2E	19280 bytes
SHA-256: `144f5d9b20412226d27710181ec248df012fbfb7d8009e353c1b09712aa35478`
`font_01_sfnt_off0000ee25.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE25	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001063c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1063C	10996 bytes
SHA-256: `7fbb2c8397ccdcc4b9977ea30c929286fe7964989113fffe90de3e60e64033b1`

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