PDF malware analysis — malicious · 89e37aad4e52990f

MALICIOUS

PDF

83.7 KB Created: 2021-09-22 13:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 2a852163a6b5d8feffce0aff92fdc947 SHA-1: 2c0124c0657b90d5267a5499ec5ef958c4997c0b SHA-256: 89e37aad4e52990fe7f95362ca0f0e44bc78b79de0f76537f49de2786f424ed0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Static analysis revealed the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. These sites host further PDF files, suggesting a multi-stage lure or distribution mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://maquinandoysubastando.com/dleyes/admin/fotos/file/90461255886.pdf In PDF document text
- https://guijek.com/userfiles/file/xutevofipanalirosimowipo.pdfIn PDF document text
- http://slbreakingnews.com/ckfinder/userfiles/files/2344842856.pdfIn PDF document text
- http://tt-ural.su/admin/ckfinder/userfiles/files/3529813922.pdfIn PDF document text
- http://ateliergermain.club/sites/default/files/file/21764264520.pdfIn PDF document text
- https://vietrocknet.org/app/webroot/img/files/kawuwuzekijir.pdfIn PDF document text
- http://a1climbing.com/userfiles/files/wiwagebipenijuwek.pdfIn PDF document text
- http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gelevumodedudibuda.pdfIn PDF document text
- http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc5904f7dc---sejeroj.pdfIn PDF document text
- http://vesimport.ru/userfiles/file/semuxejeworut.pdfIn PDF document text
- https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/96d3b2ac840b1616ea8523a0016251c1/tedaluwomox.pdfIn PDF document text
- http://greenworx.eu/images/uploads/files/33736415581.pdfIn PDF document text
- http://tabouligrill.com/ckfinder/userfiles/files/tedisegokipu.pdfIn PDF document text
- http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/lejonadapazukuv.pdfIn PDF document text
- https://commonwealthsportsawards.com/userfiles/file/86994926114.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143221d92b59---18118128079.pdfIn PDF document text
- http://perchegouet.com/ckfinder/userfiles/files/guvuvunuponugakaf.pdfIn PDF document text
- https://ritascreation.com/userfiles/file/fegagagalunidimidatu.pdfIn PDF document text
- http://sinoorchids.com/image/file/25386665023.pdfIn PDF document text
- http://stagelight.pl/userfiles/files/25357382001.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c6231e137---fikuxofa.pdfIn PDF document text
- https://terrebleue.org/userfiles/file/61389198433.pdfIn PDF document text
- http://vinhthuanvietnam.com/upload/files/wirarokimipes.pdfIn PDF document text
- http://shopgraeagle.com/ckeditor/uploads/files/59796549404.pdfIn PDF document text
- http://shengnabei.com/uploadfile/file///2021090119283136.pdfIn PDF document text
- http://glassick.com/userfiles/file/xolunufipuledolemosisu.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=rr+rw+challengePDF 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_off0000e28f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE28F	18400 bytes
SHA-256: `962d0bc926fb13133079da61b5338e236de3e1713af35edc99c0409b6019b053`
`font_01_sfnt_off00011239.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11239	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012a50.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A50	10164 bytes
SHA-256: `06cffd4e2654e8e5f6c88cbf9a72069d8f2746e4a8765e320c6d420c33810813`

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