PDF malware analysis — malicious · 9dfaf96e2359961b

MALICIOUS

PDF

92.8 KB Created: 2021-09-03 05:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 8bd6de81bad50fc1fbc27cf4a954b97f SHA-1: cf1edb7f4cbf0c2f44b4327fd884716bf85033ba SHA-256: 9dfaf96e2359961b894a117f487943dae2c885b14bb22864087aae6f11ce0ed8

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. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to act as a lure to external, potentially malicious, websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=nuclear+chemistry+pdf+book PDF link annotation
- http://manavpublicschool.org/manav/userfiles/file/15647742196.pdfIn PDF document text
- https://digireg.org/upload/69435443347.pdfIn PDF document text
- https://global-brand.net/userfiles/files/84764763663.pdfIn PDF document text
- https://castilloexterior.es/ckfinder/userfiles/files/27345975082.pdfIn PDF document text
- https://nasikampung.info/contents//files/nolum.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/26b0856e381d5fd8c68cb021e088a84d/90423429726.pdfIn PDF document text
- http://cancercareresearch.com/userfiles/file/mibakovanitorotojug.pdfIn PDF document text
- http://balone.net/_upload/file///dogapukamowitowizazoj.pdfIn PDF document text
- http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xememaxezasuvuba.pdfIn PDF document text
- http://ajk-opakowania.eu/upload/fck/file/xovagoxokakedozarol.pdfIn PDF document text
- https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072bb4a294a2---36606941863.pdfIn PDF document text
- https://tecnibat.net/uploads/archivos/fuvudixekasaj.pdfIn PDF document text
- https://roomart.uz/ckfinder/userfiles/files/ratikorelan.pdfIn PDF document text
- https://marblobath.com/app/webroot/img/files/vopenulezezovam.pdfIn PDF document text
- http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0f1be8792fd7c4759dbe5f35d1323d63/32364395164.pdfIn PDF document text
- http://alfavit.tv/userfiles/file/muvuzugefunezukejuvetira.pdfIn PDF document text
- https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/ff4596eb6c721b876b0f33141777f9ae/48293892890.pdfIn PDF document text
- http://tuclubcr.com/campannas/file/19178803132.pdfIn PDF document text
- http://abwrichmond.com/uploads/files/dizun.pdfIn PDF document text
- http://icsbc.ru/fuploader//file/podutejemipixi.pdfIn PDF document text
- http://southport1969.com/clients/861680/File/9813670057.pdfIn PDF document text
- http://bannermaul.com/userData/board/file/xurovakofomupipezirub.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858f5339e64---ziremubizivenu.pdfIn PDF document text
- http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/09e7ba09c8c63f38dad96bce78f5962a/18190308394.pdfIn PDF document text
- http://weilandensemble.nl/ckfinder/userfiles/files/pexuginosujo.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_off000103f5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103F5	18168 bytes
SHA-256: `be1e1ed7c5a11d7a165628cea4c845270327c22c12736da773e6725a43789129`
`font_01_sfnt_off0001336e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1336E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00014b85.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14B85	11204 bytes
SHA-256: `df0c7309a5703d68cbe7af28e9cb987d680a8919015be80d8b87591503dcd174`

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