PDF malware analysis — malicious · ff829a8e6655ca9d

MALICIOUS

PDF

159.8 KB Created: 2021-07-18 19:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: cb8553c850e2644d47c3161ad1b6631b SHA-1: ccc25a0d3ff98cf54e1524a2bc9e8a059f4cebfc SHA-256: ff829a8e6655ca9d592cb604314bc762ed5eac541fdd74d0bfd1439d6146fc87

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress sites and potentially disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The embedded URLs, such as http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37cc8c79e9---xefapi.pdf, are key indicators of this malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9903

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://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f011dd24efe5573b5712a0928b0046fe/95769568630.pdf In PDF document text
- http://2ds-creations.fr/userfiles/file/gonisirefitememed.pdfIn PDF document text
- http://sentezetutmerkezi.com/upload/ckfinder/files/62816550777.pdfIn PDF document text
- http://djapm.com/userfiles/file/72646119150.pdfIn PDF document text
- https://magyar-logyogyasz.hu/fileok/file/vedujepazap.pdfIn PDF document text
- https://arvikabc.com/images/uploadedimages/file/tinebedopudobuwebazivonin.pdfIn PDF document text
- http://jiangsutravel.kr/userfiles/files/20210629_141914.pdfIn PDF document text
- https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b585c12ac2b---77423166770.pdfIn PDF document text
- http://cecev.com/stockages/files/tidokekanesoji.pdfIn PDF document text
- http://anandamsanyal.com/userfiles/file/tipodiwajerixudinedopiga.pdfIn PDF document text
- https://oncallanatomist.com/ckfinder/userfiles/files/11748877552.pdfIn PDF document text
- http://rubensova16.cz/files/file/xasufekagokogu.pdfIn PDF document text
- https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094537a0bfb6---sutoge.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37cc8c79e9---xefapi.pdfIn PDF document text
- http://espacioschillout.es/images/admin/file/66390260462.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56a2d5afe.pdfIn PDF document text
- http://colorfusion.us/admin/images/file/giwoxaxerotafuzijikimilo.pdfIn PDF document text
- https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/d97927d030db244f028f2048070691b2/27540023591.pdfIn PDF document text
- http://conomiya.com/images/uploadedimages/file/79200979655.pdfIn PDF document text
- http://lctrading-gmbh.com/ckfinder/userfiles/files/natitojetiw.pdfIn PDF document text
- http://allaboutdowney.com/userimages/66299963784.pdfIn PDF document text
- https://www.lsv-wittlage.de/ckfinder/userfiles/files/16230245069.pdfIn PDF document text
- https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/c2c5c8a8140f8c9893f2fc2d8f5cdd67/23825202845.pdfIn PDF document text
- http://maxidmum.com/images/upload/fck/file/76495081075.pdfIn PDF document text
- https://amatnieks.com/pictures/image/remagiduziniradogudijujev.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=off+hand+minecraft+ps4PDF link annotation
- 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_off00020e95.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x20E95	18796 bytes
SHA-256: `36b1fa50c9383a96a1520cfe8cf3ab9314037140638bffef59db14b8b3a127a4`
`font_01_sfnt_off000240be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x240BE	10820 bytes
SHA-256: `804f6446b62c2ba6147f16650d3630fed7af76a5e0d3fdcc0978fa8dba1eaa02`
`font_02_sfnt_off0002598c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2598C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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