PDF malware analysis — malicious · 9f4edbaf42209111

MALICIOUS

PDF

81.3 KB Created: 2021-08-17 16:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: b8270749c0c2ec69ca1c1927cda4cd52 SHA-1: 5c1870015cd5a4d0fd355d78319a66d461ef3118 SHA-256: 9f4edbaf42209111d65768143b8f94b100856d9ca4d74f5a03c94ace8c5dba73

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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://www.agcontraincendios.es//ckfinder/userfiles/files/85413976818.pdf In PDF document text
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6da125e86---39777706707.pdfIn PDF document text
- https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/302edd8c9a009cefe07fd03e6b169071/seworuxumadesadakej.pdfIn PDF document text
- http://kppzp.pl/userfiles/file/sotovami.pdfIn PDF document text
- http://babamoleskine.com/files/file/8239638972.pdfIn PDF document text
- http://cpbnatation.fr/fckeditor/userfiles/file/terafipinedemawaxixekep.pdfIn PDF document text
- http://dungcumaymoc.com/Images_upload/files/22797592137.pdfIn PDF document text
- https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd5fcf86f4ded29d4e7dc848f0e92e53/fidabivugirowivibisotozon.pdfIn PDF document text
- http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/kalopivuvefunegidegira.pdfIn PDF document text
- https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/d1ab3bbda757398827c9fae6cbb0a5a2/78040053789.pdfIn PDF document text
- http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bd654a4aa---bebewopagixadibut.pdfIn PDF document text
- http://vuatoyen.com/uploads/userfiles/file/lowinegelaz.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e45be766a7560522b829a9c04a880815/65308463433.pdfIn PDF document text
- https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ffs4v1q6mdooeipq9cs9vv9bh3/vunujovuseliniborum.pdfIn PDF document text
- https://partner-support.net/user_data/userfiles/files/3060268622.pdfIn PDF document text
- http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2f7d9ce2e---93194381443.pdfIn PDF document text
- http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072644e358e0---77388185459.pdfIn PDF document text
- http://doubles301.jp/files/ckeditor/files/19851259804.pdfIn PDF document text
- http://xn--oy2b9bv81anouola.com/upload/file/202107281558361710.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8f8362999---22889697336.pdfIn PDF document text
- https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/dfab46332d7a549a6753bc6b26886020/1867260868.pdfIn PDF document text
- https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dec1b511535d1d77941c7953f819ada1/vuzomofunapej.pdfIn PDF document text
- https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608343b9ae6c3---22297870686.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=debi+e+l%C3%B3ide+filme+completo+dublado+online+gr%C3%A1tisPDF 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_off0000d49a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD49A	18624 bytes
SHA-256: `ed7b8bcf055f45f578595878c21f429c64f165781e667fe20cc80ce30d03ffc4`
`font_01_sfnt_off00010288.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10288	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011a9f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A9F	11524 bytes
SHA-256: `59ee60b63651397ca0a9fd785c5d812d786dc8cf55c6de340095e77d4685c2e3`

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