PDF malware analysis — malicious · 12c8637ee3979772

MALICIOUS

PDF

76.2 KB Created: 2021-06-12 20:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07

MD5: 0491cc9e279df8ceb65b35d306952c7a SHA-1: 3441561e38fa8a9b9a7dadc67149e06811aa8f0b SHA-256: 12c8637ee3979772a888e503426a209f408dc3192acbc972ef0a5dbb666e1559

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, directing users to numerous external URLs hosted on compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution campaign. No scripts were extracted from this sample.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/uplcv?utm_term=adding+rational+algebraic+expression PDF link annotation
- http://strahovka66.ru/userfiles/file/32650078238.pdfIn PDF document text
- https://agatanorek.com/files/file/bufelusav.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6368944b178f6ae42dc6d99bd174f4c0/suxijexizopozufipu.pdfIn PDF document text
- http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083f9ae02e52---468064457.pdfIn PDF document text
- http://elijasprojekts.lv/files/file/danezokexumaradijima.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d320feb685---jojutenuwub.pdfIn PDF document text
- https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/74451faa0661c10e62bf2f85acf7cc4b/9961653432.pdfIn PDF document text
- http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092a245dfcf7---dojivojob.pdfIn PDF document text
- http://aite-materials.com/upfiles/file/95162302701.pdfIn PDF document text
- https://cardion.dk/gfx/fckimages/file/wakewanawazegukemegakigej.pdfIn PDF document text
- https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6f0641bc5a5b03541a5ab6c9806fba22/97875662319.pdfIn PDF document text
- https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/7bb9b7350ce7e3193b0dc251a4c826be/18381058008.pdfIn PDF document text
- https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/12672ef393c17296cff242aeb37264e2/mipofudawubobosufakisudaj.pdfIn PDF document text
- https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/95ddd0dfa9cf1de44154431036c219c7/kabaxamu.pdfIn PDF document text
- http://stolizstekla.ru/userfiles/file/dowevebe.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://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://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_off0000ea9c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA9C	5440 bytes
SHA-256: `3a784854bc682c3fe60ce763c1f4307708244a53d48d6e9c48a910ebed9c3297`
`font_01_sfnt_off0000fd25.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD25	10836 bytes
SHA-256: `19167c7381554792cdc3b3b7b4706a4b6fdd0083b72a2c37d9baacc9c0d82aa7`

Open this report in the interactive analyzer, or submit your own file for analysis.