PDF malware analysis — malicious · a864e5a722ba4c8a

MALICIOUS

PDF

86.1 KB Created: 2021-09-10 20:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 6983a1f2127e7a7837a5be6670de8091 SHA-1: 6e0d6727d29fd74842046d3c887ea84fec7f068b SHA-256: a864e5a722ba4c8a0e88835aa5b769de6af80e9c6170d6cccfccba16adf0801a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and link farms, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are designed to lure users to malicious content, likely as a first stage in a broader attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=paper+mod+minecraft PDF link annotation
- http://botosani.ro/img/uploads/file/53658140229.pdfIn PDF document text
- http://vaynhe.com/upload/files/votagumigigug.pdfIn PDF document text
- http://www.primariasantana.ro/uploads/file/87028527194.pdfIn PDF document text
- https://duext.com/wp-content/plugins/super-forms/uploads/php/files/ee86d884f2692a1c7ae6d98b3864713a/4081383138.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7579c563---86363751655.pdfIn PDF document text
- http://sun-eko.eu/files/file/37022687446.pdfIn PDF document text
- http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210909_052825.pdfIn PDF document text
- http://thunderstar.cn/userfiles/file/20210903150303302874237.pdfIn PDF document text
- https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/zofivofibixukojo.pdfIn PDF document text
- https://jungleflightchiangmai.com/Uploads/files/35431554921.pdfIn PDF document text
- http://gurolmumcu.com/userfiles/file/kowagovabunatapet.pdfIn PDF document text
- http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd4712633---7923604309.pdfIn PDF document text
- https://aljazeerahpetroleum.ae/userfiles/files/99526005001.pdfIn PDF document text
- https://bomberosdenavarra.com/userfiles_nexo/files/47634124914.pdfIn PDF document text
- http://thueotodn.com/uploads/image/files/zutiguvagolafanoxab.pdfIn PDF document text
- https://myphi.biz/nbloom/fckuploads/file/widagoxupis.pdfIn PDF document text
- http://easytravel63.ru/ckfinder/userfiles/files/2743783466.pdfIn PDF document text
- http://vasekurzy.cz/userfiles/file/85446458571.pdfIn PDF document text
- https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394c332bd2a---wopevamejatowu.pdfIn PDF document text
- http://davidhammerstein.org/ckfinder/userfiles/files/30616453537.pdfIn PDF document text
- https://aquamedicasatumare.ro/ckfinder/userfiles/files/49998745029.pdfIn PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5d251f3d2---74177504024.pdfIn PDF document text
- http://hcm-invoice.vn/hinhanh_fckeditor/file/xasijodogawokanikub.pdfIn PDF document text
- http://glassick.com/userfiles/file/15757391869.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_off0000ec4e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC4E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010460.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10460	17688 bytes
SHA-256: `a272323407a002f7ebaa80f5cc71f5740d6a6d76a45d3faa19328a65a0bf1c45`
`font_02_sfnt_off00013294.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13294	10568 bytes
SHA-256: `22f61ad0c6bda4072a5062f822bfb0cf61eef0a137abceb1107e36d42eb55ef6`

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