PDF malware analysis — malicious · b677ed6fcac3f967

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 20:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: ce672a9580a32971b1f9f7dcab7af526 SHA-1: 046327a5294688c857a06a49d89e4e5491abe0a7 SHA-256: b677ed6fcac3f9673ee4d1ad14e1b0a6e211a3098161b8d3050eb10052f3345a

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous embedded URLs pointing to various websites, many of which appear to be compromised CMS uploads. The presence of these links suggests an attempt to lure users to malicious sites for phishing or malware delivery. The 'SE_URGENCY_LURE' heuristic indicates the document may contain language designed to create a false sense of urgency.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 7

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://infrive.ru/uplcv?utm_term=can+you+thaw+chicken+and+then+refreeze+it PDF link annotation
- http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46857778766.pdfIn PDF document text
- https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079616c0eb74---85339071072.pdfIn PDF document text
- https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161219bdec83b6---93212017649.pdfIn PDF document text
- https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/liiriujto3eagjrhusau66erig/ruvugolevik.pdfIn PDF document text
- http://annabarons.lv/files/files/papuma.pdfIn PDF document text
- http://na3.it/misc/file/2983285323.pdfIn PDF document text
- http://ahchala.com/img/file/sapefedika.pdfIn PDF document text
- http://africanhairbraidingsalon.com/userfiles/file/fuxonorunebalubemivo.pdfIn PDF document text
- http://srividyaastrology.com/userfiles/file/nubolutenuwupu.pdfIn PDF document text
- http://thebankcardservices.com/uploads/files/1056029974.pdfIn PDF document text
- http://asztromiskolc.hu/ckfinder/userfiles/files/62991419517.pdfIn PDF document text
- https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/okbilds7ckf11moj4c45q245dh/rakifuzoxevulolozetukid.pdfIn PDF document text
- http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/24016517024.pdfIn PDF document text
- https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/70va8qgsg18qktdq234oog5gqj/tivezuguxof.pdfIn PDF document text
- https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/11762521382.pdfIn PDF document text
- https://allcreaturesinc.com/files/files/gutawogufelirejako.pdfIn PDF document text
- http://chokmanee.com/userfiles/file/kejepirojuxiwafilupabezax.pdfIn PDF document text
- http://banghaija.com/userfiles/file/78779695982.pdfIn PDF document text
- http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49192145904.pdfIn PDF document text
- https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbc692b3b8---72816368662.pdfIn PDF document text
- https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/cced2aad0ba3794d16a7b9035c123d1e/7912324437.pdfIn PDF document text
- https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/1390b517bb01bc5f8ce18bf611804ce0/9412656136.pdfIn PDF document text
- https://binarbaidtrading.com/public_html/userfiles/file/xidiwopowujenipipafufo.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/498ce9d582e2f9e67429cb22d91c6b97/zovikopigufube.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_off0000e53d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE53D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fd54.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD54	10840 bytes
SHA-256: `6609dddaced1bcf2de75861f7856c7fc2a77a2def24fdf38db008add8bdca15d`
`font_02_sfnt_off00011672.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11672	17060 bytes
SHA-256: `f82ef048dd6ba58e381f13ea0434cea0fab3b9142d09024f45c53cdcaecf1923`

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