PDF malware analysis — malicious · c91b821a98abcecf

MALICIOUS

PDF

90.1 KB Created: 2021-06-29 12:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: e75b6eeec917b77744dd93af3391fc70 SHA-1: 077243712915d7f0b14991516acc590212ce44cf SHA-256: c91b821a98abcecf3d736185af0315f671b8de857c257deae5ffe79fbc8aadb7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution point for phishing content or further malware. The presence of multiple distinct hosts and the use of disposable hosting indicate a deliberate effort to obscure the true malicious infrastructure.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f0c03706c---62067745707.pdf In PDF document text
- http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/5d3338ac639699fb0500834e67ff6f06/47382321105.pdfIn PDF document text
- http://mojahotels.com/ckfinder/userfiles/files/juretafowajodadewode.pdfIn PDF document text
- https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/1d459b786d6b6776a3d5edd311648e94/87286904119.pdfIn PDF document text
- https://udruga-invalida.hr/files/53744932889.pdfIn PDF document text
- https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/608a29d765602a19a51745af3942a50f/33469969468.pdfIn PDF document text
- http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609040488fc79---2474072017.pdfIn PDF document text
- https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8c5657a29---pobozi.pdfIn PDF document text
- https://chpcentre.com/files/file/5260072089.pdfIn PDF document text
- https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/6b3ca57d6726b7289052df5952ad22e1/zusojomogunot.pdfIn PDF document text
- http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16071015998823---lifasadupab.pdfIn PDF document text
- http://nmglyxx.com/userfiles/file/25120378069.pdfIn PDF document text
- https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/eit6dj41vng1o9cqmtr7h4ncjk/dopufaju.pdfIn PDF document text
- http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa08748eba---22454337257.pdfIn PDF document text
- http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3af261e96c---jolakivu.pdfIn PDF document text
- https://lepjunk12.hu/uploads/files/xamajeninoxov.pdfIn PDF document text
- http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81faeb01f4---torufozavuladidesivesugok.pdfIn PDF document text
- https://sportcity.bg/webroot/img/content/files/kiriroleziranewi.pdfIn PDF document text
- http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/29189633115.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d44c23e93cf---59532552959.pdfIn PDF document text
- https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d215b7d1b7b076bf308fe38e3b8eb93/22912688280.pdfIn PDF document text
- https://securityguardsupply.org/php/uploads/file/67893385449.pdfIn PDF document text
- https://vnsteeldetailing.com/UserFiles/files/48390666066.pdfIn PDF document text
- http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/47266adcd71060af3940dbc399a84d89/1938224674.pdfIn PDF document text
- https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/0fa984e9816cc0e5c1dfcad55f068b60/poxuragoli.pdfIn PDF document text
- http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fade5d9c35---19530598746.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=green+rose+meaning+in+relationshipPDF 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_off0000ff1a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF1A	10740 bytes
SHA-256: `81765a005edd0286168074a3e75740264e8fd460851bc4cd4c82a3d806e4676d`
`font_01_sfnt_off0001179b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1179B	16500 bytes
SHA-256: `85c43f3faccede6168ecedbc38bbe93e848cb76afd140215ce83ce30ed626be8`
`font_02_sfnt_off00014283.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14283	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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