PDF malware analysis — malicious · 57448177ea80f4b3

MALICIOUS

PDF

94.2 KB Created: 2021-09-05 07:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: bffa7f8a0ed590371d487d9154b07675 SHA-1: f303b2a952485646e5e8dd8c262d88f23d79e2d1 SHA-256: 57448177ea80f4b3bd68bdd9929afe0e12e191131a32b5e1932c220bd409676b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a tactic to distribute malicious content through SEO poisoning.

Machine Learning

Nyx PDF Classifier malicious score 0.9888

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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ae0d312b9---64754420244.pdf In PDF document text
- https://reparation-mobile.net/userfiles/file/27469087036.pdfIn PDF document text
- https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/cd3fc5bd97d4fea47f7a977fb2071bcd/26990110401.pdfIn PDF document text
- http://reichspfarrer.sk/file/46574167902.pdfIn PDF document text
- https://bursac.net/userfiles/file/gasajefe.pdfIn PDF document text
- https://riondene.ch/img/uploads/file/wabewosakumako.pdfIn PDF document text
- https://promise-land.com/upload/file/fuzakuwuzolinutobatepozar.pdfIn PDF document text
- https://telewebmarketing.com/FCKeditor/file/nenoxu.pdfIn PDF document text
- https://campermagazine.tv/public/file/4829993041.pdfIn PDF document text
- http://www.alborada.es/ckfinder/userfiles/files/50200458746.pdfIn PDF document text
- http://tks-forever.com/upload/2021/06/20/file/mamovisewizafubaxizirigar.pdfIn PDF document text
- https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16129d78d99d67---valaneludaniset.pdfIn PDF document text
- http://reguitti-engineering.it/userfiles/files/sarefufawi.pdfIn PDF document text
- http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607df46f464cd---30376817981.pdfIn PDF document text
- http://teormech.ru/teormech/usrimg/file/7461032671.pdfIn PDF document text
- http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1739d957c---48419170575.pdfIn PDF document text
- https://cualuoihoanmy.com/uploads/userfiles/file/6999927772.pdfIn PDF document text
- https://accuratesearch.com/userfiles/file/86726395464.pdfIn PDF document text
- https://hiddencliff.kr/FileData/ckfinder/files/20210816_5C06F2ECD82CAD44.pdfIn PDF document text
- http://lapempi.nl/ckfinder/userfiles/files/funofalijetukupasumuzuga.pdfIn PDF document text
- https://fwullong.com/upfiles/editor/files/12534828379.pdfIn PDF document text
- https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/vm2fu0816d1e9ttn6cnoo6e6j0/33214877376.pdfIn PDF document text
- http://gemculture.com/userfiles/file/3916210481.pdfIn PDF document text
- http://sergey-yushkov.com/pict/file/namuramutukafefedujaf.pdfIn PDF document text
- http://master-sign.ru/ckfinder/userfiles/files/lepivuzulu.pdfIn PDF document text
- https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/i6e440vmjqtmo26jcjnrmjr62a/87551591356.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ntc+iso+17025+de+2005+pdfPDF 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_off000106ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106EE	10656 bytes
SHA-256: `f203456204380bf914ccad87d6431d845a9f08755944be4481be087b3ea564ef`
`font_01_sfnt_off00011f9f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F9F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000137b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x137B1	19788 bytes
SHA-256: `5fe9b104ae17fd9c703ae638a53d15225bc4e3d8851dd8b201db5d56a1c7fcd5`

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