PDF malware analysis — malicious · 4dea24a5034a4512

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 09:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: a878ca4964279181c062ca98a23517d3 SHA-1: 60e5bce50e612a2ec8c5eb8ef134bb8ece0487bc SHA-256: 4dea24a5034a4512ff345738df7779cfcdb931eb78f0c1508595646f1b12c32f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded links are consistent with phishing or malware distribution campaigns, likely initiated via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://ketchas.ru/uplcv?utm_term=aggregate+impact+value+test+procedure+pdf+download PDF link annotation
- http://huarui-bio.com/upload/files/54763087483.pdfIn PDF document text
- https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/30de382df802f1c234eea54fe2585bcc/75341405974.pdfIn PDF document text
- https://taperagi.com/contents//files/pigatodubi.pdfIn PDF document text
- https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5a9245ad3f71554cb6c9d3a8771661be/kivuramupoz.pdfIn PDF document text
- https://chiuman-hk.com/images/file/45053495112.pdfIn PDF document text
- http://evo-models.com/uploads/userfiles/files/sakokuwuweronixonolenaw.pdfIn PDF document text
- http://tks-forever.com/upload/2021/08/23/file/zajijolujolozoxipe.pdfIn PDF document text
- https://louvre.lv/res/wysiwyg/file/98778613657.pdfIn PDF document text
- http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/bitd07v5ri6705frj9pt8dpf71/42847008011.pdfIn PDF document text
- http://stonestudio.pl/files/upload/file/32973957298.pdfIn PDF document text
- http://jindi2010.com/uploadfile/files/sexoxuvugokajunowugusikad.pdfIn PDF document text
- http://angelofthewinds.net/ckfinder/userfiles/files/nawinelunat.pdfIn PDF document text
- http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/67d4f97c17d18e7afb14d39e4d1d0310/58195493944.pdfIn PDF document text
- http://tetraeng.it/userfiles/files/79758288070.pdfIn PDF document text
- http://candientushinko.com/images/file/93200517008.pdfIn PDF document text
- https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a55c7f07f---60429595724.pdfIn PDF document text
- https://shoreluxurylimos.com/userfiles/files/pupijinepedamugum.pdfIn PDF document text
- http://hockjoohin.com/admin/uploads/file/59881747069.pdfIn PDF document text
- https://diedacorporation.net/freesiafiles/file/71745686399.pdfIn PDF document text
- http://www.logomarcanet.com/userfiles/file/35333986329.pdfIn PDF document text
- https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/i3fgdcoav8je797p15b03leshf/34190229648.pdfIn PDF document text
- http://fcraregistration.com/UploadedData/file/20615778891.pdfIn PDF document text
- http://arcomproltd.com/userfiles/file/pibudifuzemopuvo.pdfIn PDF document text
- https://nidi.mk/ckfinder/userfiles/files/zejitulubula.pdfIn PDF document text
- https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e3a25321ddec05ef6ffc22f16afcf32a/fawolulowojefiwitalisofe.pdfIn PDF document text
- https://giriconsultancy.com/content_files/files/xiralusa.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_off0000e060.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE060	11196 bytes
SHA-256: `f69427f8b98c80d9b7b2c71e6bf76a4a0859b88502e9322cc78ae9e0fd8d1363`
`font_01_sfnt_off0000fa75.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA75	17160 bytes
SHA-256: `29c8dab0ee49f2add300410c3f4c3e806eadc2f60d7e4b16e2c33658237843a9`
`font_02_sfnt_off000126f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x126F7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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