PDF malware analysis — malicious · b51aca52d4182a12

MALICIOUS

PDF

75.0 KB Created: 2021-09-13 05:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 8351056852e86f4a6882ba2e7e646662 SHA-1: 530bf1bda529605fe9230d167ea4f00d79ead463 SHA-256: b51aca52d4182a124ce95e967aa4356d60e1bd22aa052db0b4deca4505407d03

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms and potentially compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The primary attack pattern involves redirecting users through a series of links, leveraging a link farm strategy.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=free+applications+downloads+for+android PDF link annotation
- http://royalrep.com/userfiles/files/72986267600.pdfIn PDF document text
- https://rtvpuls.com/ckfinder/userfiles/files/66823362171.pdfIn PDF document text
- http://fanta-life.com/userfiles/file/57436438126.pdfIn PDF document text
- http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/50943829766.pdfIn PDF document text
- https://pnp-studio.com/fckeditorfiles/file/nuwelusositerifus.pdfIn PDF document text
- http://saydersan.com/firma/files/83072620164.pdfIn PDF document text
- https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c3147e449---14065991171.pdfIn PDF document text
- http://superpart.com/files/xonunovofamugikiwisixodu.pdfIn PDF document text
- https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/97141974559.pdfIn PDF document text
- http://scard.vn/app/webroot/uploads/files/50326088532.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351adad72ad---gurubenijaloxeturi.pdfIn PDF document text
- http://paradoxine.com/upload/files/tusotobodujare.pdfIn PDF document text
- http://archgeo-leszno.pl/uploads/userfiles/files/94024355941.pdfIn PDF document text
- http://3bbb.fr/ckeditor/upload/files/5469155040.pdfIn PDF document text
- http://realtor-madrid.com/uploades/fckeditorfile/gapilokutuposoxidowexeg.pdfIn PDF document text
- http://formel1vermietung.de/userfiles/file/10946467869.pdfIn PDF document text
- https://natanashoes.com/kingkong/userfiles/files/5029882159.pdfIn PDF document text
- https://kultmotor.hu/images/files/lugepudozusixileriverufi.pdfIn PDF document text
- http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/noparur.pdfIn PDF document text
- https://vayamcs.com/content_files/files/numudoxifafutubojasa.pdfIn PDF document text
- https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/12db0802dd79b5bded5d9563c21ab21d/mabowonumoba.pdfIn PDF document text
- https://adproissy.emailingmanager.com/uploads/editor/file/meger.pdfIn PDF document text
- https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161330ca94fb08---11716748173.pdfIn PDF document text
- http://abacusnancy.com/userfiles/file/48663138358.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_off0000c22c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC22C	16716 bytes
SHA-256: `ab01d78bb0287c13d0d81fd1ffc27f97fbeb777749a04fc959571a70c36123ea`
`font_01_sfnt_off0000ed89.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED89	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000105a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105A0	10676 bytes
SHA-256: `b83ede110e564692763c89c38f4904eb905977bd868f53580aa78b97991f2705`

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