PDF malware analysis — malicious · 01548ebc9e176b15

MALICIOUS

PDF

83.5 KB Created: 2021-08-31 00:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 1491d7273fff74cb26d723c09825777f SHA-1: d260d8f7bb30b39a13ca141a592a63ca76646891 SHA-256: 01548ebc9e176b15f9e3feba655ec5890d386e98ebf6e79730406b90e53e67c5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The PDF file contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=symptoms+of+being+a+sociopath PDF link annotation
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a41f69f658aaabb30f63611841b2e600/16223425342.pdfIn PDF document text
- http://rasciindia.com/firetech/ckupload/files/joxepe.pdfIn PDF document text
- https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/irm8a90j9qfbsg39vp4vude4bs/newejofunidize.pdfIn PDF document text
- http://anhuifan.com/upload_fck/file/2021-4-29/20210429083052547841.pdfIn PDF document text
- http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083b47fa617d---6911501084.pdfIn PDF document text
- http://escuelasfutbol8.com/docs/files/2965880060.pdfIn PDF document text
- https://aquafilling.com/userfiles/file/74058798532.pdfIn PDF document text
- http://strahovka66.ru/userfiles/file/21131865769.pdfIn PDF document text
- http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/nodopuxazetip.pdfIn PDF document text
- http://k12kos.com/ckfinder/userfiles/files/95328705958.pdfIn PDF document text
- http://gardenofsound.com/userfiles/files/94760388537.pdfIn PDF document text
- https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/71bf5c187817cbec8f6202c31a8f8124/2716159027.pdfIn PDF document text
- https://nadamasristorante.it/file/97386546887.pdfIn PDF document text
- https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25ab4ce015---webusukuvekufos.pdfIn PDF document text
- http://lukinserv.hu/file/89782183102.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094c0b51cd7a---vemij.pdfIn PDF document text
- http://yotlist.com/uniformkontakt/userfiles/image/files/28356325210.pdfIn PDF document text
- http://www.mezmat.ru/ckfinder/userfiles/files/50468666750.pdfIn PDF document text
- https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086be5244e54---jexibisamowesituwuxakok.pdfIn PDF document text
- https://marblobaths.com/app/webroot/img/files/zarefarefunu.pdfIn PDF document text
- http://albino-pitti.com/pub_img/file/zinapulovurulu.pdfIn PDF document text
- http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d7a0042cd---tidawunun.pdfIn PDF document text
- https://presentkompaniet.com/img/content/file/18172104867.pdfIn PDF document text
- http://yangs-ns.com/ckfinder/userfiles/files/20210622190828.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_off0000e1bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1BC	11112 bytes
SHA-256: `943a37762065343e85e14e932e07056ad91e221d8f130a9ee9ad26866950f0d6`
`font_01_sfnt_off0000fb51.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB51	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011363.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11363	17312 bytes
SHA-256: `9903b42a6e3fb02ee8eec5f280a959d7770c803f8eb9ce36161cf4e78631afda`

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