PDF malware analysis — malicious · 73baf314e6c990a1

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 05:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 019bbb22ace9dcbab6d053628117f0e4 SHA-1: daa01f446fdf4e083c37890bc325cb72ef65e2ab SHA-256: 73baf314e6c990a18bb5c561c12714023e2a7c2cb493097ca147c2593691d94b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicates a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=gunshot+residue+analysis+pdf PDF link annotation
- https://heks-tech.com/app/webroot/userfiles/files/newuxowa.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/41939249e41eadd9858c4d78d4114a20/54180995035.pdfIn PDF document text
- https://infiniteprospects.com/FCKeditor/file/17746436508.pdfIn PDF document text
- https://www.marjojaspers.nl/ckfinder/userfiles/files/6141994199.pdfIn PDF document text
- http://chiangmai-clean.com/user_img/files/39602419408.pdfIn PDF document text
- https://gujaratisamajparis.org/upload/files/bumuse.pdfIn PDF document text
- http://chiangmai-esc.net/user_img/files/wezutimir.pdfIn PDF document text
- https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5c7979a0d---11289903737.pdfIn PDF document text
- http://huntland.hu/upload/file/wovaravosatetiwa.pdfIn PDF document text
- https://kiaavcilar.com/upload/ckfinder/files/saxuramomutafud.pdfIn PDF document text
- https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4f0c3c03d58cc06fe8001f3121a5a72c/72460635140.pdfIn PDF document text
- http://loadcell.vn/Images_upload/files/lizagiwuz.pdfIn PDF document text
- https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65dd60432e---xaludawuzoke.pdfIn PDF document text
- http://michalpavlicek.com/uploaded/file/14460209441.pdfIn PDF document text
- https://pearproperties.in/userfiles/file/tanibetoluvadupi.pdfIn PDF document text
- http://asiadomainstore.com/userfiles/file/wabitoropofiripi.pdfIn PDF document text
- http://metabolit.ru/files/file/xekorafixase.pdfIn PDF document text
- http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/doziroxotawi.pdfIn PDF document text
- http://massimoandyuethui.com/clients/69227/File/26861010910.pdfIn PDF document text
- http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/pumizisavosiwaxu.pdfIn PDF document text
- https://sunarchegypt.com/userfiles/file/72163330142.pdfIn PDF document text
- http://ekolojikweb.net/upld/userfiles/file/9833601086.pdfIn PDF document text
- http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16121845f72769---93244450162.pdfIn PDF document text
- https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0244ae676b0728990d519bc4c53b7e83/41021215030.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_off0000d45a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD45A	18244 bytes
SHA-256: `19397a72e30e9dd3c72345cb8ca02688e364dcc78039bc314f8b36ca42a3959e`
`font_01_sfnt_off000103c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103C4	10848 bytes
SHA-256: `1a79015a8354adecbe7e78f199719b53c29396ba82f7c41eb2718664dae1fa8f`
`font_02_sfnt_off00011cce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CCE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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