PDF malware analysis — malicious · 71cfd5273f5a9bd1

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 10:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 9d40c515ab0f3de4e6334e6e491f5acf SHA-1: a9659776681babcffe9c4d0a3947769c64809ef2 SHA-256: 71cfd5273f5a9bd167b45fd6f5282d4503c0b731e192bb2d8d49299b0d2a58fd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, many of which appear to be compromised WordPress upload directories. This suggests a multi-stage attack where the initial PDF serves as a lure to download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9934

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://www.lucaslobker.com/minor/ckfinder/userfiles/files/50477383923.pdf In PDF document text
- http://builderall.info/userfiles/file/xalofedagufusinumuro.pdfIn PDF document text
- https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/36ffe616356144baa6b563f484bf6687/4555771858.pdfIn PDF document text
- http://ajivikafinance.com/userfiles/file/dobabe.pdfIn PDF document text
- https://istanbulbalbir.com/upload/ckfinder/files/72891783932.pdfIn PDF document text
- https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbc644f585---25399558655.pdfIn PDF document text
- https://corpus.bg/files/fck/file/71135042375.pdfIn PDF document text
- https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e7a85f662---nekuvubugusakoxunagom.pdfIn PDF document text
- https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffc0b23cad7---5355641151.pdfIn PDF document text
- https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a60b0d73b---56936367703.pdfIn PDF document text
- http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd7536b1d0---85699441768.pdfIn PDF document text
- https://avenue102.com/uploads/file/6565119910.pdfIn PDF document text
- http://pavimenti.pl/web/uploads/files/xaluvexiwedutawa.pdfIn PDF document text
- https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b52fb8ea5f79c9975d8f674c82f9e23e/mimij.pdfIn PDF document text
- http://emailreceptionist.net/userfiles/file/doxuzevefezazames.pdfIn PDF document text
- https://coimbatorepressclub.com/FCKeditor/userfiles/file/3098215775.pdfIn PDF document text
- http://cen7dias.es/userfiles/files/54175885195.pdfIn PDF document text
- http://nissanotogovap.net/uploads/images/files/85859702895.pdfIn PDF document text
- http://castudio.eu/userfiles/files/27275820094.pdfIn PDF document text
- https://adikkeempat.com/contents//files/94625174612.pdfIn PDF document text
- http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa8afeab9f---muxuwigiwadi.pdfIn PDF document text
- http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c960c13391---28184005399.pdfIn PDF document text
- http://musorcentrum.hu/files/article/file/3625284089.pdfIn PDF document text
- https://10glazsikeyrosa.ru/file/vopogovam.pdfIn PDF document text
- https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b79bae802---nexezebovarurejawap.pdfIn PDF document text
- https://odontologosmalca.com/images/userfiles/file/53552230855.pdfIn PDF document text
- http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ada9182782---57528375478.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=after+effects+101PDF 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_off0000dc1a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC1A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f430.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF430	9960 bytes
SHA-256: `659bb5a17160843fdc61876f5cade62ae3821ca64d146edfc19993c82a52812d`
`font_02_sfnt_off00010a76.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A76	17692 bytes
SHA-256: `ff55d9d48aeaa2d847cc3f628f0c46472d801332068bc530cb5cec6ffe022a22`

Open this report in the interactive analyzer, or submit your own file for analysis.