PDF malware analysis — malicious · ecd21ad0685e6f6d

MALICIOUS

PDF

85.5 KB Created: 2021-09-05 22:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: ad1dd0d8571357fcd3bbd1d2fbdd877c SHA-1: 48bb08e20a18077ba7a988b574918940f2b6de9a SHA-256: ecd21ad0685e6f6d8a24665a13b27422cbf1035b388cc0b891e36ed176221f6a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated high maliciousness. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure strongly indicate an attempt to deliver a secondary payload or phish credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 http://kiiga.ru/userfiles/file/sarukepup.pdf In PDF document text
- https://aldurra.ly/images-editeur/img/file/9977164863.pdfIn PDF document text
- https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/57ad251531538a720f09a6120357684a/seliwotofip.pdfIn PDF document text
- http://clasesholandes.com/userfiles/file/xubokiduzosigopisofukivu.pdfIn PDF document text
- https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e7143645e0990f0ca0fd705701f0b589/20037569042.pdfIn PDF document text
- https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160918b006e400---31517096013.pdfIn PDF document text
- http://dashoernerboot.de/userfiles/7979497275.pdfIn PDF document text
- http://watdoenwevandaag.nl/upload/vilusarepawipegumapa.pdfIn PDF document text
- http://kwiatmetal.pl/userfiles/file/morukitukijudusipasi.pdfIn PDF document text
- https://kermoulin.com/userfiles/file/4391925711.pdfIn PDF document text
- http://www.hcc-cpas.com/siteuploads/editorimg/file/bewuralebe.pdfIn PDF document text
- http://clarksville.net/wysiwygfiles/file/vesugot.pdfIn PDF document text
- https://congchung7.com/upload/file/97501918564.pdfIn PDF document text
- http://sosonomo.com/ckfinder/userfiles/files/bejolulovujarupasawej.pdfIn PDF document text
- http://www.anjhimayath.com/upload/file/denezixonoxajixujolej.pdfIn PDF document text
- http://dryoucosmeceutical.com/userfiles/files/12432687141.pdfIn PDF document text
- https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e50ce86aefeff1c234d0191c22648cf6/dijuvujikuvubinu.pdfIn PDF document text
- http://topoint.cc/userfiles/fckFile/20210706051918.pdfIn PDF document text
- http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/domogezulovozotelitaroke.pdfIn PDF document text
- https://ural-aiti.ru/admin/ckfinder/userfiles/files/gozunebivuja.pdfIn PDF document text
- https://stillwaiting.org/userfiles/file/zarodosenuse.pdfIn PDF document text
- https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/lip2jh95j7r5po1eosh9u0lma6/rosanatifofufutowuked.pdfIn PDF document text
- http://odpadykj.cz/UserFiles/File/tagifafikidimijewabejiloz.pdfIn PDF document text
- http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16112cb68ba8c6---vomajutotulapidivi.pdfIn PDF document text
- https://clubslotalmatriche.com/calcas/file/35814131912.pdfIn PDF document text
- http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/i0ee2hfm08ehtpii0vt0sfgt96/towaguxozupasejivetasu.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cryptid+hunters+pdfPDF 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_off0000e83e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE83E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010055.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10055	10512 bytes
SHA-256: `c6686557be4a83f4b517d1c89a14e18a6331ceac68a627d12e9fc2799708df43`
`font_02_sfnt_off00011838.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11838	18544 bytes
SHA-256: `64e7262cd43ac8ac68471e1f2e5b861ae7aace956fda60385a9b1046ce79e048`

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