PDF malware analysis — malicious · eee61a47bddde755

MALICIOUS

PDF

76.7 KB Created: 2021-10-23 12:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 0ba0a9299e1fcc30965b159ef67d5e90 SHA-1: 4f8df21c944f911bef5068f378ef2228e8e873a6 SHA-256: eee61a47bddde755e05dff25b31c72b1e6070c72bd151eb24a4c248a0f9c0533

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

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://kaptenhoki.com/contents/files/vadigeragurosorokozar.pdf In PDF document text
- https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1616b87dc1d8bd---20821381861.pdfIn PDF document text
- http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614223e38cda6---nuzediladadujopelupeji.pdfIn PDF document text
- https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/razagosedajazijad.pdfIn PDF document text
- https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16161a3185a2cf---dotamigadifinupubemimazi.pdfIn PDF document text
- http://ayurvedicclinic.org/userfiles/file/nipojufup.pdfIn PDF document text
- https://samsungklima.net/upload/ckfinder/files/61551628828.pdfIn PDF document text
- https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/27ce1aaf04fc85d949ed94d8b5d1f1f2/68101205851.pdfIn PDF document text
- https://chsins.tw/uploads/files/202110230516257828.pdfIn PDF document text
- http://bjavc.com/filespath/files/20210911212723.pdfIn PDF document text
- http://kapsalonindex.nl/images/uploads/27072134523.pdfIn PDF document text
- http://shopgraeagle.com/ckeditor/uploads/files/80959469248.pdfIn PDF document text
- http://bowie.abwingsmd.com/uploads/files/43666377830.pdfIn PDF document text
- https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/m8tuk2a6mqvqda7p1me1c7e8bc/tovobinemofotozekeb.pdfIn PDF document text
- http://csc025.com/userfiles/file/20211004020413_ibjrab.pdfIn PDF document text
- https://feedproxy.google.com/~r/Gsjc/~3/tgwjJlsMqHc/uplcv?utm_term=exception+in+electronic+configurationPDF 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_off0000c628.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC628	18348 bytes
SHA-256: `9feab09a8754437f5c5af0be9ed8c61921d34e5e02c5dc6177efe9922a60c710`
`font_01_sfnt_off0000f587.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF587	10672 bytes
SHA-256: `8f2f21a41f5f65b8a481be06777b37eacb6e5cf1ac4df1651724d2d5eecdda2c`
`font_02_sfnt_off00010e23.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E23	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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