PDF malware analysis — malicious · 8df80eae718a5c5f

MALICIOUS

PDF

74.1 KB Created: 2021-09-04 06:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: d451464d3e2941a9cef607bcc0b8bd38 SHA-1: 28deeee1898ecaf2b797979d93299ae75b754a65 SHA-256: 8df80eae718a5c5f23f9721810dee741bdad2bb9b629e3cc5bf59230b80da8f1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous external URIs and link farm patterns, suggesting it directs users to compromised websites or disposable hosting for further payload delivery. No scripts were extracted, but the presence of multiple malicious URLs and the overall structure strongly suggest an intent to exploit users via redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9827

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://archism.ru/uplcv?utm_term=geometry+proof+problems+worksheet PDF link annotation
- http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcc365fe12---bababatifafumaboxabux.pdfIn PDF document text
- https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea07cb9301---wopif.pdfIn PDF document text
- https://wegofa.com/userfiles/file/17145481544.pdfIn PDF document text
- http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/4111e9f22da651a412ac0f2d660cbc8f/budake.pdfIn PDF document text
- https://www.iieng.org/editor/ckfinder/userfiles/files/zokonenivutu.pdfIn PDF document text
- http://onlinepravenconsultant.com/uploads/wysiwyg/files/51883707894.pdfIn PDF document text
- http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798733c703c---rimeburetib.pdfIn PDF document text
- http://tamker.hu/userfiles/file/vurigowiwasipiv.pdfIn PDF document text
- http://erex.hu/upload/file/fugizopokezatosuwowi.pdfIn PDF document text
- http://0851gay.org/userfiles/202107file/2021071000520970554.pdfIn PDF document text
- https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/fba0gp6qphgpgmbbjvrk8fd843/3685126085.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce84837af4e---63586718035.pdfIn PDF document text
- http://vistobrasil.net/uploads/file/4026904406.pdfIn PDF document text
- http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092c1c204282---dodifanoxa.pdfIn PDF document text
- http://chanakyaaerospacedefence.com/userfiles/file/59695482578.pdfIn PDF document text
- https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/9ufnlt5prlm9gc00lh00h8phr4/vufame.pdfIn PDF document text
- https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/4g8f2mj3m6fnkprf8r5lock3eb/18606918751.pdfIn PDF document text
- http://gazdalkodjokosan.hu/img/userfiles/file/nawixiwojofabomosi.pdfIn PDF document text
- http://thermogroup.ru/uploads/files/13173469835.pdfIn PDF document text
- http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba5a67d4ea---25524925554.pdfIn PDF document text
- http://www.sport-konyv.hu/userfiles/file/17857099739.pdfIn PDF document text
- http://fenotropil.ru/userfiles/file/59262891146.pdfIn PDF document text
- http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ad4c7f13---2878914778.pdfIn PDF document text
- http://bidwoodmachine.com/d/files/21268135250.pdfIn PDF document text
- http://kingtonkatsu.com/uploads/files/galozinemajexutobi.pdfIn PDF document text
- http://stark-tools.ru/images/uploaded/67096370724.pdfIn PDF document text
- http://bizbecho.com/pa/trainstation/uploads/image/file/tijurawidusupusala.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_off0000bd07.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBD07	18012 bytes
SHA-256: `df0368bff89e2d67a6914c99b9ad83a8cf089fe717e2a9714fbcbc0286be6d66`
`font_01_sfnt_off0000ea6a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA6A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010281.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10281	10736 bytes
SHA-256: `283d4c89d957aba8ffec092c07968bf1a571b748cf931f231af3c6d3a727861e`

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