PDF malware analysis — malicious · 720a8eb1229d4078

MALICIOUS

PDF

97.2 KB Created: 2021-08-15 23:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18

MD5: b4d2d86db95d73fa8a608bb197501e4c SHA-1: 12b28c7283e5cecd722f4809db586afacf9e923f SHA-256: 720a8eb1229d4078f41b1198fc70689e7fa1bfdd13078f81bf839288c39494fd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's part of a link farm hosted on compromised CMS uploads. The PDF contains numerous URLs pointing to other PDF files, suggesting a tactic to distribute malicious content or engage in SEO poisoning. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9377

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://techson-cctv.com/upload/file/80951342832.pdf In PDF document text
- http://potlista.com/file/files/togamuwitiwuturelu.pdfIn PDF document text
- https://mumegram.com/userfiles/file/5216833730.pdfIn PDF document text
- https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae0052f902---22072761186.pdfIn PDF document text
- https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d277e75b0fa---tofodisipaf.pdfIn PDF document text
- https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b749a388c40dcbcabef0dd4be0b90cbc/24759493019.pdfIn PDF document text
- http://hytechplus.com/userfiles/file/bakubarekolevuralejerijew.pdfIn PDF document text
- http://conblocmanado.com/pics/file/xopiwuzapobafepojitobeluj.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077d005802a5---guwogodewo.pdfIn PDF document text
- http://lapenya.cat/imgjovesnaves/file/69725882684.pdfIn PDF document text
- http://rw-hse-businessconsulting.de/userfiles/file/tozaligijavafotivurijovod.pdfIn PDF document text
- http://www.heksan.com.pl/file/11783348043.pdfIn PDF document text
- https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/sogebefakeve.pdfIn PDF document text
- https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/0fv7iqu7v1rb8pa7dluv2des6c/66298334523.pdfIn PDF document text
- http://polymer-optix.de/userfiles/file/xinon.pdfIn PDF document text
- https://liniagdanskzydowo.pl/files/74744933056.pdfIn PDF document text
- https://actaviaserica.org/board/file/files/lasomutujexitisipovurefa.pdfIn PDF document text
- https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/7eafe38752c8a64b99c218d87babf957/nijam.pdfIn PDF document text
- https://ratsimae.ee/media/contents/file/6371855963.pdfIn PDF document text
- https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/f0ba20cb975232916a205fffbe9e4cc7/96867599495.pdfIn PDF document text
- http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f176abae1---jadonizijetine.pdfIn PDF document text
- http://www.advokat.com/app/webroot/img/fck/file/vinovitogewuxi.pdfIn PDF document text
- http://rivebistro.net/ckfinder/userfiles/files/futupelesobawilirudikevi.pdfIn PDF document text
- http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/u24ef41a649qv21fuuhgfoqao5/1163189847.pdfIn PDF document text
- http://tcsm62.org/uploads/news/file/lirurokowujuwunafuzu.pdfIn PDF document text
- https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c863d115f4c27dd96ee2f3506d226261/13780009452.pdfIn PDF document text
- http://aloisiquadri.it/userfiles/files/janarakaxiv.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=multiplier+et+diviser+par+10+100+et+1000+exercices+cm2PDF 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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e781.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE781	2008 bytes
SHA-256: `638b68e23ef5b1860922c356c9f01f310df6b8753f6b885aa4771830269cd819`
`font_01_sfnt_off0000f09c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF09C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000108ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108AD	16664 bytes
SHA-256: `0a962203f4cec7707222521f6378443ea742356c6c25c446a7ef5e4b92f6b00d`
`font_03_sfnt_off00012048.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12048	11008 bytes
SHA-256: `7c018fb4665a70ea7aba01811c665fb9ef7c92eae8ebb13ab5e052dba332f939`
`font_04_sfnt_off00013a07.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13A07	22492 bytes
SHA-256: `5580873320c94753dbaf8479316f1b45f2ad71b77a7d25ffdb362ffe3c887408`

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