PDF malware analysis — malicious · 8725ff4f75fdd40d

MALICIOUS

PDF

86.3 KB Created: 2021-07-03 11:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 3665f4d90467c78ed9d16ae14f6af3e3 SHA-1: 23789957d60be809fc3a903d8c9ea100b191be39 SHA-256: 8725ff4f75fdd40d75ba8b3babecd8b719139f9ccd7edf484f03625ec55988d2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

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://medvor.ru/uplcv?utm_term=in+the+end+remix+mp3+download PDF link annotation
- https://communeouchamps.fr/userfiles/file/xowumu.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f1486aad9---44129142237.pdfIn PDF document text
- https://adikketiga.com/contents//files/20371209367.pdfIn PDF document text
- https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2e67559154752f2a5202c567163cbced/5662145991.pdfIn PDF document text
- https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc716207c8---peferezamuzotidebinap.pdfIn PDF document text
- http://hutbephottaihaiphong24h.com/upload/files/vapavutizatedup.pdfIn PDF document text
- http://edu-family72.ru/content/images/uploads/file/15927928162.pdfIn PDF document text
- http://woorymart.com/userData/board/file/temiz.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/571a288fe345249aff4dc165cea2efa8/wamewubozup.pdfIn PDF document text
- https://communeouchamps.fr/userfiles/file/63152587315.pdfIn PDF document text
- http://desagresbrts.com/clients/34568/File/45355039041.pdfIn PDF document text
- http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/896ff0108ff3bf903af25aea6cd77c39/delezikafivovezaduju.pdfIn PDF document text
- https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16097de6c08e60---vovegamapa.pdfIn PDF document text
- https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/cvrav32ffmbkursgs6o7h0qluo/wazimabozogoxiw.pdfIn PDF document text
- http://sistersaviopublicschool.com/userfiles/file/watuxowem.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6843dbd8f79aed30c5c88bdc7128c855/nofibugejafezidotiwifam.pdfIn PDF document text
- http://3dprofi.net/images/uploads/file/vobilim.pdfIn PDF document text
- https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/844568d1b3d72c5d54b37ab1f17c036f/zizazado.pdfIn PDF document text
- https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/g4gr3kmvhcgm52u62s6jbel7m8/9345211617.pdfIn PDF document text
- https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ja00u88n1j90ntv37r03mqrjae/rezalapulusidogabu.pdfIn PDF document text
- https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/113618177f35e1ad7507da112581b008/solinorojugogefegizit.pdfIn PDF document text
- http://resetimpianti.it/reset/public/file/81730478734.pdfIn PDF document text
- http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607e624281d68---kidilogajirupopa.pdfIn PDF document text
- https://signika.pl/Upload/file/4001053633.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_off0000ce93.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE93	19592 bytes
SHA-256: `8d9389bb790e132b15cf5d3c47f32f3cf6cdc5c9768d5439fcf0adf6cbab1709`
`font_01_sfnt_off0000ffcc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFCC	17612 bytes
SHA-256: `ed30cc1fe136cfd8a81994759c8fd1d1e25e7c1e9a4c1b95f190968c659f4dbf`
`font_02_sfnt_off00011a75.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A75	10800 bytes
SHA-256: `3f569e6804d9dd186d052a24c48b0266de2d83bb1085378caf69614dd3b81dd1`
`font_03_sfnt_off0001332b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1332B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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