PDF malware analysis — malicious · 033d7fe023df3920

MALICIOUS

PDF

91.9 KB Created: 2021-09-19 08:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: ef8f53e770836a05af176bff5950e961 SHA-1: 1ff7d12f0212c6a66abdb062db0c056886d44b41 SHA-256: 033d7fe023df39209d9d099350281da3100281d919f316d49974d61c533030fc

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 designed to redirect users, and ClamAV detection confirms it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing and potential malware distribution intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9937

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://huntic.ru/uplcv?utm_term=sword+art+online+eugeo+and+alice PDF link annotation
- http://balmybnb.com/t/tutorfirm/uploads/ck/files/94257342913.pdfIn PDF document text
- http://roocenter.ru/upload/file/najepiwutekobizikerufode.pdfIn PDF document text
- https://paymentor.nl/uploads/file/84984779051.pdfIn PDF document text
- http://campbellelectronics.com/uploads/rizajunufobug.pdfIn PDF document text
- https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161303319dcfb2---jopodidajasup.pdfIn PDF document text
- https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133e8b7dc5c8---zipugop.pdfIn PDF document text
- http://nbc.ua/design/pic/file/bisikujadebu.pdfIn PDF document text
- http://cravaluos.com/ckfinder/userfiles/files/46804698693.pdfIn PDF document text
- http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16142341ba2b8c---9092998883.pdfIn PDF document text
- http://giteduguedesboires.fr/userfiles/file/sudix.pdfIn PDF document text
- https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/a0a31ef5f38b1998ca64a788d9285c42/28433118297.pdfIn PDF document text
- http://www.stadion-zarya.ru/ckfinder/userfiles/files/fopeb.pdfIn PDF document text
- http://leinerpakgelatine.com/survey/userfiles/files/sadimejasuno.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a4c6e487b---lezidogago.pdfIn PDF document text
- http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345dcc113db---28161486542.pdfIn PDF document text
- https://grup-rul.ro/printuri-fi/files/davob.pdfIn PDF document text
- https://nakipoglugroup.com/upload/ckfinder/files/57828431143.pdfIn PDF document text
- https://moderator.lt/components/com_mijoshop/opencart/image/data/files/zesijixa.pdfIn PDF document text
- https://aneri12.eu/res/file/75374804531.pdfIn PDF document text
- http://101-games.ru/images/uploads/files/sebolatosudilefanutave.pdfIn PDF document text
- https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161356957a2c79---83721130658.pdfIn PDF document text
- https://paperland.bg/uploads/file/27236219109.pdfIn PDF document text
- http://ardeche.proximeo.com/ckfinder/userfiles/files/namasiruvavo.pdfIn PDF document text
- http://4998horo.gmmwireless.com/contents/files/12558640426.pdfIn PDF document text
- http://berallebags.com/UploadFiles/FCKeditor/20210912070449.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_off0000fe4c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE4C	19460 bytes
SHA-256: `acb09f372041436d9cd101a2433e452ae77f02e007f6715e932df07df56441c3`
`font_01_sfnt_off000131bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131BB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000149d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x149D2	10640 bytes
SHA-256: `eba5cf0635ef0f5cda40c048afd5e747647a87b09615852aede2b245846fb51b`

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