PDF malware analysis — malicious · 8e3e5ce97553bdfa

MALICIOUS

PDF

74.7 KB Created: 2021-08-27 23:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: e5ac967b751a67db6f3b337fbc49438e SHA-1: ee3e1f83e8e0f9c952b383bf95299c8e12404c99 SHA-256: 8e3e5ce97553bdfa270ab3b80b6386a0f9928403965c3d66c2741d00e71a20e8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links, many pointing to other PDF files hosted on compromised CMS upload storage. This behavior is indicative of a link farm designed to distribute malicious content or facilitate phishing attacks. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9934

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://jackinthegym.com/uploads/files/202108190851229895.pdf In PDF document text
- https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/f77932d26b021692ddc9902c5eb1e160/31383737711.pdfIn PDF document text
- http://formpart.com/upload/ckfinder/files/sofatevobifabakokezamexu.pdfIn PDF document text
- http://gowowdeli.com/uploads/files/2917131201.pdfIn PDF document text
- https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cd3442c55---86098002077.pdfIn PDF document text
- http://eszixv.hu/ckfinder/userfiles/files/tuvitowinizulezamowi.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074c9af756db---72888093148.pdfIn PDF document text
- http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c188c4392---6227811991.pdfIn PDF document text
- https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3b10d6a6500b2128ceefde9fa9dd1bb9/togunokorexo.pdfIn PDF document text
- http://pogologistics.com/ckfinder/userfiles/files/nulewefoperoxosega.pdfIn PDF document text
- http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097831c9a3e5---mezibo.pdfIn PDF document text
- https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/d1055d19948f75cd24780d78eb3d8fb0/84168568878.pdfIn PDF document text
- http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ac62ca2fbee---19141471662.pdfIn PDF document text
- http://www.videobezopasnost.ru/ckfinder/userfiles/files/puvokazupumesuzunid.pdfIn PDF document text
- http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c691faed866---43303525851.pdfIn PDF document text
- http://finproekt-msk.ru/userfiles/file/69105344926.pdfIn PDF document text
- https://thediamangroup.com/_images/files/16405930412.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59423b5ffe---27998173274.pdfIn PDF document text
- http://ekonopuntos.com/campannas/file/didakabe.pdfIn PDF document text
- https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117b5538cb71---44491812152.pdfIn PDF document text
- http://bannails.com/fckeditor_userfiles/file/lomededozonorinoxig.pdfIn PDF document text
- https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/rsvdfimppal5fsekql7jgepkc9/wufilike.pdfIn PDF document text
- http://www.iece.in/userfiles/file/45002000992.pdfIn PDF document text
- http://holzweiss.at/vorir.pdfIn PDF document text
- https://rasathantrananotech.com/ckfinder/userfiles/files/15194417057.pdfIn PDF document text
- https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/55972946bab839e61c160b1f1cd04e2c/fukunodezanilijan.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=difficult+spot+the+difference+printablePDF 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_off0000c0b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC0B9	10956 bytes
SHA-256: `3024535c1d127f70437dc1360785de2c80bc7bfdca5596f1f36a1118fd75226e`
`font_01_sfnt_off0000d9d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9D7	16376 bytes
SHA-256: `9809c5a9128fda0806dab4705461685c5aadb1bbe941e33047f2b4f99a5481c4`
`font_02_sfnt_off000103f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103F0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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