PDF malware analysis — malicious · 65bddee210675ca3

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 10:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 82f52a30547fc393a9c7acac994e3fe4 SHA-1: 61983d9f91d177859172d902b7730c1e9f9d8d9b SHA-256: 65bddee210675ca394bdfb1dc6b6451797048c002e6e4bfc2ed2fa40398495f0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is a PDF detected as malicious by ML classifiers and ClamAV. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination and leverage compromised infrastructure. No scripts were extracted, but the overall structure and URL patterns strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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=hisuite+windows+7+download PDF link annotation
- https://ngoctraithaibinhduong.com/uploads/news_file/64045625257.pdfIn PDF document text
- http://www.pattyn360.com/upload/forum/files/63889952143.pdfIn PDF document text
- https://www.hkha.com.hk/ckfinder/userfiles/files/vageniletubajev.pdfIn PDF document text
- https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/5868e19a51cdb77c3be61cdaee9235f6/37011671631.pdfIn PDF document text
- https://soportedevida.mx/ckfinder/userfiles/files/ludurebulakit.pdfIn PDF document text
- http://imhyuk.com/imhyukeditor/userfile/file/82515736267.pdfIn PDF document text
- http://wsm.hk/images/files/57898413540.pdfIn PDF document text
- https://indicaperu.com/userfiles/file/24373121669.pdfIn PDF document text
- https://toppelletmachine.com/d/files/pamajofomesejififufo.pdfIn PDF document text
- http://misosmile.com/upload/editor/files/9279660999.pdfIn PDF document text
- https://art-eria.pl/mandarynka/pliki/files/vekibo.pdfIn PDF document text
- https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/kopatanerekeritinizimabi.pdfIn PDF document text
- http://smflow.in/admin/uploads/file/17569941789.pdfIn PDF document text
- http://pxmonastery.org/CKEdit/upload/files/90813509586.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8f6f9f4fa---karojerebej.pdfIn PDF document text
- http://shipagents.nl/uploadfiles/file/5197250765.pdfIn PDF document text
- https://accuratesearch.com/userfiles/file/15684968399.pdfIn PDF document text
- https://www.karelo.com/uploads/File/wojibezuzuli.pdfIn PDF document text
- http://joltiy.ru/uploads/files/tevolularuzazaramopasem.pdfIn PDF document text
- https://inunekocp.jp/mailmagazine/upload/files/89852531716.pdfIn PDF document text
- http://gonganmi.com/userfiles/file/30255437517.pdfIn PDF document text
- https://autoskola-scp.com/files/vevewawedof.pdfIn PDF document text
- https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/8a464bfe783d2622352ea8af3a4b9f9b/34065469779.pdfIn PDF document text
- http://stomerijindex.nl/images/uploads/nalufufefopano.pdfIn PDF document text
- https://infiniteprospects.com/FCKeditor/file/buxisekub.pdfIn PDF document text
- http://uslugi-ogrodnicze.pl/pliki/File/xabimovokozigo.pdfIn PDF document text
- https://indikino.com/ckfinder/userfiles/files/2697520412.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_off0000d9dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9DD	16084 bytes
SHA-256: `1a9321640aecbe54ffb13630b40a4a9d1381bb680d77310e9e275c27292713a3`
`font_01_sfnt_off0001034b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1034B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011b62.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B62	10368 bytes
SHA-256: `80be753031aa496cd670609207d4122eec49b96117fdf3eceb95e551c0b9526c`

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