PDF malware analysis — malicious · 936f0a8ff3b261ea

MALICIOUS

PDF

99.3 KB Created: 2021-09-15 04:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: d3e41f7bfdb8b6b6814b070e83c7691a SHA-1: fbd41022947c7aec185a20370d46be7ff4de2c89 SHA-256: 936f0a8ff3b261eab20462411456ddb24800146efcc55d1459e3a49b62228338

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of these links suggests an attempt to lure users to external, potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9910

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://wastran.ru/uplcv?utm_term=trading+price+action+reversal PDF link annotation
- http://www.peritaonline.es/ckfinder/userfiles/files/lasavebenobokov.pdfIn PDF document text
- https://ecoverservice.be/gallery/file/zutafijovulefolavuvimud.pdfIn PDF document text
- https://greenlakepaint.com/ckfinder/userfiles/files/suwodewujavogafiviror.pdfIn PDF document text
- https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161354efa5a521---61285149584.pdfIn PDF document text
- http://kleinschadenexpert.de/userfiles/file/11979411535.pdfIn PDF document text
- http://betonkeritesek.eu/Content/files/nesogififa.pdfIn PDF document text
- http://zrdb-drogbud.pl/Upload/file/93469586096.pdfIn PDF document text
- http://bedrucken24.de/userfiles/file/nijasejotixumuvujoret.pdfIn PDF document text
- http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa9a7d290---gakugalivovokosotugax.pdfIn PDF document text
- http://abwingssuffolk2.com/uploads/files/81387744923.pdfIn PDF document text
- https://yukkumpulgroup1.com/contents/files/50042512405.pdfIn PDF document text
- https://sssmri.com/ckfinder/userfiles/files/25276987439.pdfIn PDF document text
- http://de.ruben.pl/ckfinder/userfiles/files/5592588828.pdfIn PDF document text
- https://ww150003.linebot.net/upfile/files/20210913012128.pdfIn PDF document text
- http://sbriz.ru/userfiles/file/nelogikipimoxewozuname.pdfIn PDF document text
- https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161414921be56e---90461030823.pdfIn PDF document text
- http://dataction.org/demo/dataction/media/zuxenobutesam.pdfIn PDF document text
- https://meganimal.pt/site/upload/file/sudatotodif.pdfIn PDF document text
- http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56316293360.pdfIn PDF document text
- https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/7749c1eee6e7d817063769b5fd6cec3a/pagax.pdfIn PDF document text
- http://mistral-paints.cz/userfiles/files/gonoro.pdfIn PDF document text
- https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb7c65aad---moribenusodipisabon.pdfIn PDF document text
- https://kanalprofi.at/UserFiles/file/zurowodupomuk.pdfIn PDF document text
- http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sapejogelinakowomepako.pdfIn PDF document text
- http://goldenagegroup.vip/userfiles/file/jivizewexafezabixolixeto.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000106d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106D6	17976 bytes
SHA-256: `175998bb49b511faee9c22897027d839da75578212aa28da74c74908ce3b1956`
`font_01_sfnt_off000135e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x135E4	16836 bytes
SHA-256: `645820c595d4038498db028c8b5d80835908cfe6b43d33359db03e6d05944cee`
`font_02_sfnt_off00014e28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14E28	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off0001663f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1663F	10716 bytes
SHA-256: `2fcb9a2796b2d216e5294edde698064496f96d7776278578b170cc9678888386`

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