PDF malware analysis — malicious · 8ed7bb08b5558ef4

MALICIOUS

PDF

68.7 KB Created: 2021-10-03 18:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 337e09c95f1b189bbc9667049a89b0d0 SHA-1: 275dbda89b7e5bce9d2b3db558a70e80ddc57d78 SHA-256: 8ed7bb08b5558ef4157f79cc8c8d600b9a04a112397ef0082740b7400cdde705

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the URLs and the overall structure point towards a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

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 https://pixomot.ru/uplcv?utm_term=wisconsin+child+care+ratios PDF link annotation
- http://zaun-produzent.de/userfiles/file/7288369585.pdfIn PDF document text
- http://gianenricofabro.com/userfiles/files/52351364328.pdfIn PDF document text
- http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/qkc8eg2tk94be8sea8e3799sut/3889828289.pdfIn PDF document text
- https://eghamatkade.com/basefile/eghamatkadecom/files/24799218469.pdfIn PDF document text
- https://masihpt1.com/contents/files/24359457375.pdfIn PDF document text
- http://neurooperations.com/ckfinder/userfiles/files/16476542709.pdfIn PDF document text
- http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/33bc8c3c547c0bbde97f20a8df7d7466/41302356876.pdfIn PDF document text
- http://worldsocialistpartyindia.org/ckfinder/userfiles/files/96184513375.pdfIn PDF document text
- http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391920a93b9---runipefanajanadaxu.pdfIn PDF document text
- http://gonuldoviz.com/upload/ckfinder/files/89605719819.pdfIn PDF document text
- http://allivecoat.com/userData/board/file/1753404745.pdfIn PDF document text
- http://brezov-gaj.si/uporabnik/file/91923489365.pdfIn PDF document text
- http://vaness-sens.fr/ckfinder/userfiles/files/45458600446.pdfIn PDF document text
- http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/75257229913.pdfIn PDF document text
- https://gbagencement.fr/uploads/file/jarupovegijoturefife.pdfIn PDF document text
- https://questyme.ca/userfiles/file/mowofonijemaro.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/jefodoteranelajasadixawep.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_off0000aaec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAAEC	16048 bytes
SHA-256: `7ef8b60cf473c54bd275ace2e8500cc34e54085b095c7df7446307dfb1855763`
`font_01_sfnt_off0000d41f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD41F	10460 bytes
SHA-256: `e29b7667c5642cdb5d175feb87ef6fa0cd6fcde461def586d7f579a7125f2f60`
`font_02_sfnt_off0000ebd1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBD1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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