PDF malware analysis — malicious · b71b8333cc4e4286

MALICIOUS

PDF

88.1 KB Created: 2021-07-30 01:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 7454526c65d5bb88c921461cb09e1d9d SHA-1: a9762ab59abe5ebf352fe010ab53588b3325dee5 SHA-256: b71b8333cc4e428617e7651e957d8551dd255221e1922d47f734e5dfcc9c8a94

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users into downloading further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9886

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 http://astro2sphere.com/admin/images/file/65332647559.pdf In PDF document text
- http://ats-dz.com/userfiles/file/4053735750.pdfIn PDF document text
- https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb5851057d---vazosefosove.pdfIn PDF document text
- http://jtour.vn/userfiles/file/76871362094.pdfIn PDF document text
- http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befa2714da1---pekevopevikif.pdfIn PDF document text
- https://vannordenvastgoed.nl/userfiles/file/razidikeza.pdfIn PDF document text
- http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd270e994d---gumulobajemapefeterofaso.pdfIn PDF document text
- http://pogservice.ru/userfiles/file/67239831676.pdfIn PDF document text
- https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/3cceo1i5hm71sfk87al55ao0c9/76211269904.pdfIn PDF document text
- https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079057c27eb6---koveg.pdfIn PDF document text
- https://migger.dk/userimages/file/ruvomapofuzibafedijibinin.pdfIn PDF document text
- https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/waxov.pdfIn PDF document text
- https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/0ttn7ajum5v1p5p961aad928kg/ziluxiwedexoworapipoz.pdfIn PDF document text
- http://nuovartea.eu/userfiles/files/zojivadaveximivisusod.pdfIn PDF document text
- http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/wosazo.pdfIn PDF document text
- http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/najogebaxik.pdfIn PDF document text
- https://aurorabersinar2.com/contents//files/pivexajubiki.pdfIn PDF document text
- https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/4485f3e7ea33eba782259d3556388e29/wewagafe.pdfIn PDF document text
- https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ad1b6edbc---zanelejozegenomuvobifixa.pdfIn PDF document text
- https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/2r8gml5q4g5ms6h7j3ic309gn3/53150466847.pdfIn PDF document text
- https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/f81b36c479fb0b0859344aba56c9ae79/nimulidimowurujodirelez.pdfIn PDF document text
- http://tahi.hu/ckfinder/userfiles/files/putererila.pdfIn PDF document text
- https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3485a328894da8be371e90c2d4f3b55b/52599024774.pdfIn PDF document text
- http://anhuizhkj.com/upload_fck/file/2021-7-27/20210727123113468231.pdfIn PDF document text
- http://cgl.lu/userfiles/files/66268508266.pdfIn PDF document text
- https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3e756ceb800d7e21d1e4a63019b309ce/vowaxazosogozudu.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=uc+browser+for+pc+windows+7+free+download+32+bit+2020PDF link annotation
- 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_off0000f2ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2AD	16712 bytes
SHA-256: `314b6b87ea174f966ea3d43cf409fbcacd82cc1200fe26d91030448ff8eccfe9`
`font_01_sfnt_off00011e43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E43	11312 bytes
SHA-256: `019eba16f7debd16d9091ea360ca1cf9f396e1e25b69f16981b743d7011d708d`
`font_02_sfnt_off000138ec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x138EC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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