PDF malware analysis — malicious · 145cb6ff9afdf7a9

MALICIOUS

PDF

83.2 KB Created: 2021-07-02 07:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: cbe3d38b1a43dd0d8740baef69a5e9c4 SHA-1: 93f5c042a3c1af6f354b46adf86a1efc373111d7 SHA-256: 145cb6ff9afdf7a997064291971748c8e38abb32b088fd2bfb69ef9b955bbc51

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 compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The presence of multiple external URIs and link farms suggests an attempt to direct users to potentially malicious or deceptive content.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/acsd0u9ad4g2ftrgdcp58utusg/juviwub.pdf In PDF document text
- http://codemessaging.net/ckfinder/userfiles/files/17126501214.pdfIn PDF document text
- https://viboot.com/ckfinder/userfiles/files/kubumojoxabesif.pdfIn PDF document text
- https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e182369b0---tizimarafigoju.pdfIn PDF document text
- https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/22146240109.pdfIn PDF document text
- https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e45ded71f---levasoniwiketarovovene.pdfIn PDF document text
- https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaf749f563---3575965493.pdfIn PDF document text
- http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16087aaec746ca---26984145869.pdfIn PDF document text
- http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160869e6b2e99b---50030638963.pdfIn PDF document text
- http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608799ace99fd---pogukuzunowalajagufoxa.pdfIn PDF document text
- https://ocw.tw/uploads/files/32059034537.pdfIn PDF document text
- https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/h0v6ncqomdjstdu4rviog7bni4/54115435030.pdfIn PDF document text
- https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/06f1b578b1fed78a1ec33ee36d6da887/46066900781.pdfIn PDF document text
- https://smilaxlabs.com/userfiles/files/49287837799.pdfIn PDF document text
- https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c29ccd26937---11341818036.pdfIn PDF document text
- http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/45906827477.pdfIn PDF document text
- http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/62fbf229b5f03393ed6632668b1bda6d/99055728603.pdfIn PDF document text
- http://beiks.info/public/file/9547840692.pdfIn PDF document text
- http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077180ce4849---7974573944.pdfIn PDF document text
- https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9199ada028---femilagadubovebe.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7362ngjcaml76mb6kj0h9jjlr2/zejenilelemozegidizinos.pdfIn PDF document text
- http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b64659f4a2875c00775ac297362030e7/xapulisatanotebego.pdfIn PDF document text
- http://brlairport.com/images/file/62285298919.pdfIn PDF document text
- http://art-lan.ru/uploads/assets/file/88739103931.pdfIn PDF document text
- http://mppscstudy.com/admin/usercontent/file/gejov.pdfIn PDF document text
- https://chemasan.lu/userfiles/files/guxekebupuwoniwivi.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=kenwood+ts940s+service+manualPDF 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_off0000d46a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD46A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ec81.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC81	11140 bytes
SHA-256: `71ebf8ab68a9e0c3ee2eb4f2536455dfdb5a254b7238ae7cea08b32bddad09d5`
`font_02_sfnt_off000106a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106A5	21796 bytes
SHA-256: `54c852b2ad6f66b009b0a849e819cc91c0e87474a069271a03199f6d71f268b4`

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