PDF malware analysis — malicious · d3653ddb74e6eb30

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 08:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: d5b8e870ac92604551f20df3f68120cd SHA-1: 9e29dabc4903a4f18afd710116df8550dcb61209 SHA-256: d3653ddb74e6eb30f056ac5dc065325a845dab492057a8d0fa5d26f5cf4e2e44

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to obscure the final destination. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://cructi.ru/uplcv?utm_term=punch+hero+play+store PDF link annotation
- http://utpcomp.ru/uploads/files/40702327633.pdfIn PDF document text
- https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/sedekilagisaf.pdfIn PDF document text
- http://laser-piskovani.cz/democms/userfiles/file/16542372246.pdfIn PDF document text
- https://corcreation.twbiz.me/data/fckeditor/files/20210904_175444.pdfIn PDF document text
- https://topclassgardening.nl/images/file/64905931697.pdfIn PDF document text
- http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161444c3fa1d92---motinux.pdfIn PDF document text
- https://loyallcanada.com/editor_files/file/jiziro.pdfIn PDF document text
- http://www.ecvbrass.ch/user/web/file/mavavakovovedefixusuf.pdfIn PDF document text
- http://vitalenzyme.com/uploads/fckupload/file/vofobodobusugudabulezaf.pdfIn PDF document text
- https://alutat.com/data/file/30736206111.pdfIn PDF document text
- http://uniquecharacters.com/upload/files/nuzexunivuzupujuruxomado.pdfIn PDF document text
- http://iiiemjobs.com/FCK_Editor_Images/files/76857632336.pdfIn PDF document text
- http://sartor.ru/upload/files/59036171158.pdfIn PDF document text
- https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/23153232069.pdfIn PDF document text
- https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/5b98h9cbmv6d27b4hq6h1icj6m/18480870256.pdfIn PDF document text
- http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6a2176584---97806450422.pdfIn PDF document text
- http://daeryuhealthcare.com/ckupload/files/nizitosijiwesowiranin.pdfIn PDF document text
- https://dazhonghua1688.com/ckfinder/userfiles/files/pokironefanezo.pdfIn PDF document text
- https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161372d33e3af9---xigidetuzipifijananuvu.pdfIn PDF document text
- https://meesens.be/KrMee/Tekstverwerker/83066854064.pdfIn PDF document text
- http://baovekhucongnghiep.com/upload/files/39335758987.pdfIn PDF document text
- https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e0ba7ef8a7cff78de81de5e120e099b/55690645971.pdfIn PDF document text
- https://citronel.com/userfiles/files/34947875414.pdfIn PDF document text
- http://gdlejia.com/uploadfile/files/20210919_042408.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_off0000b33d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB33D	15736 bytes
SHA-256: `68376c630a3961264c1c4834ed869f43fd2be162b34e7be23a7efcf93fd97677`
`font_01_sfnt_off0000db1d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB1D	10596 bytes
SHA-256: `37a31ce90a848feb3b2a751cc57216afe87e830e5a65d102683cc9a1e58bdf1d`
`font_02_sfnt_off0000f35c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF35C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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