PDF malware analysis — malicious · e5bb3e7cb0e04e29

MALICIOUS

PDF

69.7 KB Created: 2021-09-15 21:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 65e1ab4165ee1ac527bce4643ff4fc57 SHA-1: 28a9679896c4e21af15a87b827c3633182edb819 SHA-256: e5bb3e7cb0e04e29dcae88e401cf920f65b0c53f2bb2289f7de97ac5fd33a9e5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, a common technique for phishing or distributing further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

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://philabc.ru/uplcv?utm_term=it+follows+123+movies PDF link annotation
- https://olterus.com/contents/files/velepexodigezipalu.pdfIn PDF document text
- http://www.szphotar.com/admin/img/files/xomajitiganesatod.pdfIn PDF document text
- http://titadoorbinhduong.com/upload/files/85271679252.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/sjiv919akmlnrl7buq6ea3h1j5/setanebivuxanilivu.pdfIn PDF document text
- http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136771447e1a---37975852688.pdfIn PDF document text
- http://studioferrato.it/userfiles/files/59259644394.pdfIn PDF document text
- http://hyundaihungthinh.com/uploads/images/files/25035002602.pdfIn PDF document text
- https://hchoanglong.vn/userfiles/file/sabixorevapopanax.pdfIn PDF document text
- https://nmg.lv/img/uploads/files/puvetawunajid.pdfIn PDF document text
- https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/75402772035.pdfIn PDF document text
- https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/50d22586314357db63c9554768ebfd0b/68083759511.pdfIn PDF document text
- https://aihr-iadh.org/uploads/FCK_files/file/34749279350.pdfIn PDF document text
- http://cameranichietsu.com/luutru/files/xikovaxi.pdfIn PDF document text
- http://integrotech.eu/zdjecia/file/83433570830.pdfIn PDF document text
- http://aptekadc.pl/userfiles/userfile/natisojepasewupozurakol.pdfIn PDF document text
- https://groupunsur1.com/contents/files/86478300088.pdfIn PDF document text
- http://justsayhi365.com/uploads/file/43784065349.pdfIn PDF document text
- https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/71471005921.pdfIn PDF document text
- https://mytopics.it/uploads/file/53236152629.pdfIn PDF document text
- http://compsult.net/userfiles/file/46526577619.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_off0000b13d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB13D	10456 bytes
SHA-256: `f50d750a8c2ddab8551c038c61933592756f31ddc19583dfb970f220fa54a28e`
`font_01_sfnt_off0000c93a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC93A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e14c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE14C	15828 bytes
SHA-256: `59925f550f986a6788a72b1ec08780ec943e403688c978ed850d0fb38b9f8079`

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