PDF malware analysis — malicious · 7ebaa2d4d1bb4ee9

MALICIOUS

PDF

78.1 KB Created: 2021-09-07 01:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: e6183a79a903523b874d1d5247b4b09d SHA-1: d2f7c31e0a9f48be22fc79e68c48c0eaa2bef597 SHA-256: 7ebaa2d4d1bb4ee94adf0cbc7729152050613427626b93fc9f9586466f90c6c7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external URLs hosted on compromised CMS uploads and disposable domains. These URLs are likely used for phishing or to serve further malicious content, aligning with a spearphishing attachment attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://allytemp.ru/uplcv?utm_term=gateway+a2+second+edition+tests+pdf PDF link annotation
- http://liveisagenix.com/ckfinder/userfiles/files/18152688691.pdfIn PDF document text
- http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/9q3m4a9gbt5a2jufh9v5lqn167/gonemik.pdfIn PDF document text
- http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865c66041d8---doxuwo.pdfIn PDF document text
- https://rjpexport.com/files/motamoj.pdfIn PDF document text
- https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/53004317242.pdfIn PDF document text
- http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b58926669---vizatosalupimaxaxeve.pdfIn PDF document text
- https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/489c42948b4ecbb0c1267b012f4c67a6/51049971413.pdfIn PDF document text
- https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/e1198034f6ee842feb93268e76799238/xalirisapop.pdfIn PDF document text
- http://dream-mebel.com/pic/file/xuriraxu.pdfIn PDF document text
- http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092a172b1b9d---bigub.pdfIn PDF document text
- https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d76407999---xijev.pdfIn PDF document text
- http://brezov-gaj.si/uporabnik/file/69376311731.pdfIn PDF document text
- http://pathtojanna.com/userfiles/files/43168127691.pdfIn PDF document text
- https://mondialardesia.it/file/6521891410.pdfIn PDF document text
- https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/89003705112.pdfIn PDF document text
- https://infotechloyalty.com/bot/ckfinder/uf/files/2027965425.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48506993a0---gigimasafikurabubox.pdfIn PDF document text
- https://mumegram.com/userfiles/file/18192146060.pdfIn PDF document text
- http://pileshoppen.dk/userfiles/file/xojinibuzazulikex.pdfIn PDF document text
- http://ghalemdi.com/userfiles/file/birizuwamuzigana.pdfIn PDF document text
- http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/15514176959.pdfIn PDF document text
- http://newworldss.com/uploads/file/74119598018.pdfIn PDF document text
- http://edu-family72.ru/content/images/uploads/file/juzagapuvune.pdfIn PDF document text
- https://ddshower.com/ckfinder/userfiles/files/77932894604.pdfIn PDF document text
- http://brmxn.com/userfiles/file/20210701175131_hg70pg.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cd25.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD25	17092 bytes
SHA-256: `117d817b91c17cf7cac53646b57f43f147d29eef154e583a7f614ecdf61f1f9b`
`font_01_sfnt_off0000f957.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF957	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001116e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1116E	10824 bytes
SHA-256: `c78257e0363174a104edac0e1797f3faaa6b1f3eceb6721444e61c4ae0d0e50d`

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