PDF malware analysis — malicious · 20b03a2b8a62ef0e

MALICIOUS

PDF

74.9 KB Created: 2021-06-04 06:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24

MD5: 8fda1a423f1246486a3174059d922299 SHA-1: e128ae3f657334de1f1b42584e6fef8ba8447afa SHA-256: 20b03a2b8a62ef0e81413949a887bd68d5629e88f315cf1a6d13364bfcd8ea37

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though partially corrupted, indicates a lure related to 'dynamic programming applied to network problems', likely to entice users to click the embedded links.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

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://nomylo.ru/uplcv?utm_term=1.3+la+programaci%25C3%25B3n+din%25C3%25A1mica+aplicada+a+problemas+de+redes PDF link annotation
- https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/b95e41e94902db8c9d501db05dd572ae/31767243625.pdfIn PDF document text
- https://dprkoreatour.com/uploads/files/98695535011.pdfIn PDF document text
- https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074d1a6d65d7---vagematoma.pdfIn PDF document text
- https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/6d36cc42de7a1d866f85556827b7cc92/11855962562.pdfIn PDF document text
- https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160733e0bda617---vapakuwitatuviwovubatu.pdfIn PDF document text
- http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5429878297---laxazuzemakawi.pdfIn PDF document text
- https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/efb1c78386162d5d2757869acb4c3f43/visiraxolelakip.pdfIn PDF document text
- http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/ns3vit1q6n3eipicka6lsoovc3/povomezaropapulokerelal.pdfIn PDF document text
- https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/55056fc103d1cbdc84f96605c09a16b9/48918916768.pdfIn PDF document text
- https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2f67b3ddec669cdd2375b67e525d42ff/8786096451.pdfIn PDF document text
- https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/1085fbeb9cef0c4d6f1863563164b03a/67121951668.pdfIn PDF document text
- http://ohappy.org/userData/board/file/79523536353.pdfIn PDF document text
- https://fullhousetourism.com/UploadFiles/file/20210526222615154.pdfIn PDF document text
- http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16084ed44be94b---96685383124.pdfIn PDF document text
- https://meganimal.pt/site/upload/file/bufowaxe.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e649.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE649	6056 bytes
SHA-256: `dc081612d82c84f01f13358e5ac06b6dad21bdcf7524b811c37bcebe0d3d0703`
`font_01_sfnt_off0000fa00.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA00	11776 bytes
SHA-256: `dbb2ed5cc9251c1fd5130d7158845c7b740ddf23cf3de357c26176f65d3762f6`

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