PDF malware analysis — malicious · 828c07ac22a86787

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 17:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: ee854023bd8b3953100db54fbbc47b83 SHA-1: 8e69c7aa5d8cb3e99aa9b78e4130ee00a2a72f4a SHA-256: 828c07ac22a86787cbec9bcdef606e680ff78f7c289864be3bc10f85bfb21a5a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary attack pattern involves luring users to external sites, likely for phishing or to download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://garglob.ru/uplcv?utm_term=pivot+table+multiple+worksheets+excel+2016 PDF link annotation
- https://beautyyaurient.com/editor_upload/file/niramipigu.pdfIn PDF document text
- http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/subajejenudisadisowub.pdfIn PDF document text
- http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16091ebc2b8668---6604488077.pdfIn PDF document text
- http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/6e994127d857f691d9865cb75aef08c7/24941485158.pdfIn PDF document text
- http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/5vj1d2f3jbn8vnh522vcqa5np1/52785874142.pdfIn PDF document text
- https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a88b8a4198d0010c962bd818f5801097/66815388532.pdfIn PDF document text
- http://winso.tw/userfiles/file/mutino.pdfIn PDF document text
- https://efficimm.fr/userfiles/files/gisid.pdfIn PDF document text
- https://kimtuong.vn/isc/public/files/fckupload/file/24276343063.pdfIn PDF document text
- https://elegune.net/files/galeria/files/81733188191.pdfIn PDF document text
- https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f550d8893f---85141965816.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e531a995b4f---kijowuxesakafovosima.pdfIn PDF document text
- http://kronospan-mofa.hu/editor_up/28395779924.pdfIn PDF document text
- http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16113176162d15---67327703760.pdfIn PDF document text
- http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d212ded1d9b---pesuxe.pdfIn PDF document text
- http://lasfyy.com/uploadfile/file/20210621073141902.pdfIn PDF document text
- http://perila-vrn.ru/userfiles/file/24929877768.pdfIn PDF document text
- http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb38939f08---63027365099.pdfIn PDF document text
- https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117f3db81897---nevawawilediwibatu.pdfIn PDF document text
- https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f8025bffb---47224183139.pdfIn PDF document text
- http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25868c9165---15487304796.pdfIn PDF document text
- http://ranjitabiswas.com/userfiles/files/kirulenubebokubuvud.pdfIn PDF document text
- http://benedictinoselrosal.org/ckfinder/userfiles/files/57579805646.pdfIn PDF document text
- https://traveletrust.com/basefile/traveletrustcom/files/sugutaguma.pdfIn PDF document text
- http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ecd51dbd0---zatagiwevifogorudibefu.pdfIn PDF document text
- http://3sdent.com/upload/files/xilorezojasujeku.pdfIn PDF document text
- https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160982f08b9dab---44930083000.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_off0000df99.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF99	17708 bytes
SHA-256: `608b3dd5a2b44bac7bd0378be8962c8cbdf9727ee5b2acd2c847b3fac7acc933`
`font_01_sfnt_off00010cce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CCE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000124e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124E5	11584 bytes
SHA-256: `32c16371b0a50d3ea11c441fc1820cfd06cbc02d30c24e32a62c700d3230be1a`

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