PDF malware analysis — malicious · d3213eaddbd30dcb

MALICIOUS

PDF

71.7 KB Created: 2021-09-10 02:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 020001aff2f78b1f470e1b94068317ec SHA-1: 8ba0c14806d43e91e0f54f7e4deea245b0cbf521 SHA-256: d3213eaddbd30dcbe0148469a5df75b24ecb715233ebe4304387c751a6d8b617

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=drishyam+1+online PDF link annotation
- http://astmasme.com/userData/board/file/69618060819.pdfIn PDF document text
- http://ahzycw.com/upload_fck/file/2021-9-2/20210902035222153497.pdfIn PDF document text
- https://ceccardolj.ro/userfiles/file/4602323025.pdfIn PDF document text
- http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/68561330391.pdfIn PDF document text
- http://shinex-auto.com/userfiles/file/1615213291.pdfIn PDF document text
- http://hiroshima-teishaku.com/userfiles/file/17658047390.pdfIn PDF document text
- https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d3ee78f1bc5890db43ba41f82d133508/50608203271.pdfIn PDF document text
- http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/lufedif.pdfIn PDF document text
- https://carmelocuritiba.com.br/ckfinder/userfiles/files/retefuvifitaxomavo.pdfIn PDF document text
- http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8ade1cc2b---tagaz.pdfIn PDF document text
- http://baove24h.info/upload/files/xebutu.pdfIn PDF document text
- https://swaarm.de/app/webroot/upload/files/narevob.pdfIn PDF document text
- http://espacioschillout.es/images/admin/file/56204881585.pdfIn PDF document text
- https://www.domosystem.gr/ckfinder/userfiles/files/86379379580.pdfIn PDF document text
- https://accuratesearch.com/userfiles/file/5381453024.pdfIn PDF document text
- http://wcsps.com.tw/ckfinder/userfiles/files/kidelijuzuwiwepapose.pdfIn PDF document text
- https://limsurempat.com/contents/files/73917486809.pdfIn PDF document text
- https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/ce32b78280704eab56d584d536435895/47774815528.pdfIn PDF document text
- https://cplastik.com/data/cms/file/wutobusad.pdfIn PDF document text
- http://topoint.net/userfiles/fckFile/20210904195025.pdfIn PDF document text
- http://binhchuachay.info/Images_upload/files/93751057196.pdfIn PDF document text
- http://akifkasaboglu.com/esatfisek/images_upload/files/pevesutulepokememugefo.pdfIn PDF document text
- http://zoop-tech.com/ckfinder/userfiles/files/loranet.pdfIn PDF document text
- http://hatowo.com/app/webroot/uploads/files/mopofofumugigijim.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_off0000b7c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB7C2	16188 bytes
SHA-256: `10bd5e3803bcc9878cd4cad010ffb82e59b1d241595ecca551897f8ca06f7674`
`font_01_sfnt_off0000e1ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1EE	10440 bytes
SHA-256: `859c2e4ea73f3a2b8d8ba2e39cf31d177869080ad10072ad546f4ba12a6cdf70`
`font_02_sfnt_off0000f976.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF976	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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