PDF malware analysis — malicious · ba6e2815ee739fec

MALICIOUS

PDF

71.9 KB Created: 2021-09-26 03:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 1e25b2041ffe76221d35b9254a32e429 SHA-1: 2478c0d04a39edcc4b7cd1a511628320db955d9c SHA-256: ba6e2815ee739fec86cdf539dfeeb03384e83bb4e4ec6b2074fb4bdf224e099e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and link farms pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 6

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.
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://crewmak.ru/uplcv?utm_term=android+source+code+free PDF link annotation
- https://bimore.vn/webroot/img/files/moxorobavixevagopiz.pdfIn PDF document text
- https://blogsma.com/files/9988098001.pdfIn PDF document text
- http://d-a-s.cn/userfiles/file/kinoretase.pdfIn PDF document text
- https://izr.fr/files/keditokafusufu.pdfIn PDF document text
- https://vhssirimpanam.org/ckfinder/userfiles/files/36773380294.pdfIn PDF document text
- https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/7393940032.pdfIn PDF document text
- http://hotelborgodeipoeti.com/userfiles/files/8186459831.pdfIn PDF document text
- http://baigeleather.com/userfiles/file/gelis.pdfIn PDF document text
- http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f70f884082---duxusukinagetamolimofowij.pdfIn PDF document text
- http://holdemigny.fr/ckfinder/userfiles/files/rujulotexomorazupipa.pdfIn PDF document text
- https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308d3aeadf2---ratowakigezegelad.pdfIn PDF document text
- http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f915f6710b---gobolagiladilerer.pdfIn PDF document text
- http://iscyber.com/userfiles/files/vanuroxiditatotiwo.pdfIn PDF document text
- http://habitat3.eu/userfiles/files/44780158215.pdfIn PDF document text
- http://icloudcleaners.com/uploads/account/autoresponderfiles/8322237535.pdfIn PDF document text
- http://aitrans.cn/UploadFile/file/F1202109090254214128.pdfIn PDF document text
- https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/8f882c8a94727e27fff52339c29f20a6/julubodivexizunovunuxosu.pdfIn PDF document text
- http://fatename.com/uploads/files/202109050817484285.pdfIn PDF document text
- http://packagingandfoodmachinary.com/userfiles/file/wipudi.pdfIn PDF document text
- http://mishor-uvk.com/uploads/files/8726883173.pdfIn PDF document text
- https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d0e9009285324f3d85b316db0c23a804/28505083556.pdfIn PDF document text
- http://adamlegal.com/userfiles/file/dabopipowafosiviwi.pdfIn PDF document text
- https://perfectsextherapy.com/public_html/userfiles/file/52842926936.pdfIn PDF document text
- https://siemreaptraveltours.com/userfiles/file/22231023065.pdfIn PDF document text
- http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c7f3d78c96---5439976046.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_off0000b42a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB42A	10244 bytes
SHA-256: `3cd1621a459bb840ff9456ccab91cfc22f184f0b15edcdf41b29e8a197cda6bc`
`font_01_sfnt_off0000cb50.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB50	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e362.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE362	18128 bytes
SHA-256: `1e9038c1451b2378dc4872801bd8f74f701fa77dc678fe86eaf56c452332116c`

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