PDF malware analysis — malicious · 5c28e106aaba2003

MALICIOUS

PDF

78.8 KB Created: 2021-07-01 19:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: fabdd37902c2fb20fe1d5ad363e08c00 SHA-1: 5bc8fd1a3272b717eaf05b75614d2628bac56500 SHA-256: 5c28e106aaba20034bfde325a71581d8fedd04fee417ab9d18601bd8ee85d7f1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://stef-nancy.fr/upload/document/4588204063.pdf In PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1af768a7d1---paxitirel.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c5288b61e1ad66525c8ce686e25ead1a/4079201757.pdfIn PDF document text
- http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffa3fe86b5---solanijumuzikutuk.pdfIn PDF document text
- http://digifast.cz/userfiles/64351889543.pdfIn PDF document text
- https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608023813454d---pefadunatezofe.pdfIn PDF document text
- https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/1ae05d075ba2ca55323152c7aee1b67b/nenasudatux.pdfIn PDF document text
- http://amongelite.com/ci/userfiles/files/14201282395.pdfIn PDF document text
- http://studioindelicato.com/userfiles/files/65226551666.pdfIn PDF document text
- http://dioceseofniranam.org/userfiles/file/jerikakud.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f8e4e750b011e26f38de754dfd1c7393/tutezupapuzobur.pdfIn PDF document text
- http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095d701e53bb---tixodasiz.pdfIn PDF document text
- https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b935e88af75---turalirero.pdfIn PDF document text
- http://donateagift.eu/userfiles/file/83460180037.pdfIn PDF document text
- https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/33d3ac29fb1d84730abb54b1c3a00cc6/34242043778.pdfIn PDF document text
- https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16074c73e957d8---xetus.pdfIn PDF document text
- https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/8efa397ec157ff32ae0a235f8306e18f/fesukawuve.pdfIn PDF document text
- http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f93a2b30f---rifufubuweraki.pdfIn PDF document text
- https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/367a0db591cb8d0bd9ed7e208c350820/fufapa.pdfIn PDF document text
- http://fructusartis.com/i/File/8095499471.pdfIn PDF document text
- http://vitajeans.com/ckfinder/userfiles/files/zeneditul.pdfIn PDF document text
- http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8b368cf9e---59465212158.pdfIn PDF document text
- https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/657d55cdf82373bbd8688b4bd29ced2a/nomokileriwuri.pdfIn PDF document text
- https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/0394edcf60523f0292c65891b2ecb1b1/ritososokubemoferupi.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=word+for+tiredPDF 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_off0000d6d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6D1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eee7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEE7	9860 bytes
SHA-256: `aeebcc0f13779ef0fd1c4602e3b9bd66f6b5501548c05f187ea170f914d3530b`
`font_02_sfnt_off000104af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104AF	16128 bytes
SHA-256: `0e16c07d38eb271ee126fc04e37d8e6870f19246e052065e627846da31ce94a9`

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