PDF malware analysis — malicious · 13281f7807fb558e

MALICIOUS

PDF

83.8 KB Created: 2021-08-31 09:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 2461b18e29e83d5857d70be9f1e7baa4 SHA-1: 10bb27cebd7d12506c6aec0040ce0a955db71c5c SHA-256: 13281f7807fb558e7c2e08d526647fe446acfe1d2fb09917e8a0496757db8075

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or to download further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://ketchas.ru/uplcv?utm_term=crib+meaning+in+english PDF link annotation
- http://geyuping.com/geyuping/uploadfile/file/2021082722105773499.pdfIn PDF document text
- http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82a813bb00---89854117114.pdfIn PDF document text
- http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/65331126740.pdfIn PDF document text
- https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/46cf7c8fd3b5a54c6279707b1ae0ae18/guvoviboxozanopuk.pdfIn PDF document text
- https://tenekedjieva.com/uploads/file/fudojimifa.pdfIn PDF document text
- https://homeuu.biz/upload/ckeditor/pages/files/97069467178.pdfIn PDF document text
- http://kool-house.com/upload/editor/file/96500158445.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e436e6bc1d7061614869a418f2f4d13c/petoj.pdfIn PDF document text
- http://phutungotodungha.com/img/files/xapubavogapawemexomibefos.pdfIn PDF document text
- https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d40eba458---voruxewukubozajo.pdfIn PDF document text
- http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00fd4b01ed---firekibajup.pdfIn PDF document text
- https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/2qta5gnp1tbimcs0ar3hto62ja/2959245444.pdfIn PDF document text
- http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce2f47ecbc---xusoxojenudunipekuxini.pdfIn PDF document text
- http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a216b096a55---95822588171.pdfIn PDF document text
- http://seibyou-koujien.com/files/files/61131167512.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f426413d25---pokisa.pdfIn PDF document text
- https://spheresignal.com/app/webroot/userfiles/files/90239162669.pdfIn PDF document text
- https://euro-m.si/web/dokumenti/file/vofesalojarogok.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/157uo994t1c0jd03d743o84q95/8676594255.pdfIn PDF document text
- https://ambient-interier.cz/files/files/9313923177.pdfIn PDF document text
- http://fanti-fitness.pl/uploads/assets/file/fetosefokalusadaroli.pdfIn PDF document text
- https://dijitalsanat.link/upload/files/zoporixosifekomunogeku.pdfIn PDF document text
- http://anhuizhkj.com/upload_fck/file/2021-5-3/20210503093227843775.pdfIn PDF document text
- https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bfad756b4---78508759742.pdfIn PDF document text
- https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16114f1c66f771---55070718653.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_off0000dc43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC43	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f455.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF455	20060 bytes
SHA-256: `29b9158a1fb71cded1bb0a61503a99dac55be3928c0ddb08803df29de10fd079`
`font_02_sfnt_off000128f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128F9	10508 bytes
SHA-256: `d694dc126319b67e00043e4a72a8783afab2e4d9e39a22c0657716a41abbbe6c`

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