PDF malware analysis — malicious · b63b137d84bc8a15

MALICIOUS

PDF

123.6 KB Created: 2021-07-21 11:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 187e06515be7f95cc6037463eb650323 SHA-1: 33f58c696841a437693b2883f753c761673bb1f8 SHA-256: b63b137d84bc8a1556bff9218f6d9563107ceafb56213af39162e90909c6c330

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload storage and disposable hosting, characteristic of a link farm used to distribute malware or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9809

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://asiquim.com/ckfinder/userfiles/files/dufimivesanis.pdf In PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc7fb26011---23435015428.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fa18f1dc6---solanevej.pdfIn PDF document text
- http://karat-dobremiasto.pl/userfiles/file/toxup.pdfIn PDF document text
- https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec06e93264---84685720975.pdfIn PDF document text
- http://ruresept.ru/files/file/wegiwevujevibemapareg.pdfIn PDF document text
- http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/b01658dcd57da797a3a03fe65ddfba64/gozesajuwodozopi.pdfIn PDF document text
- https://bibonatura.hu/ckfinder/userfiles/files/puruxexuduvubunuligo.pdfIn PDF document text
- https://fenixfalt.com/userfiles/file/mojimexomozotafanene.pdfIn PDF document text
- http://psychoterapia-przemysl.net/img/userfiles/file/lopalobuzeku.pdfIn PDF document text
- http://apexnepaltravel.com/userfiles/file/betiwewagogotigejozesuta.pdfIn PDF document text
- https://cleartunemonitors.com/ckfinder/userfiles/files/popejobikuvemob.pdfIn PDF document text
- http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a902a86af1e---burolamip.pdfIn PDF document text
- http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/torasivelewideguwafixalu.pdfIn PDF document text
- http://austintownfitch1980.com/clients/879833/File/47099773617.pdfIn PDF document text
- https://cvconstructionsgoa.com/pharma/admin/userfiles/file/31148600983.pdfIn PDF document text
- http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/04cc09a43bfe065fad0285a78557082d/wesukufimef.pdfIn PDF document text
- http://cbgnfinance.com/userfiles/file/15916837059.pdfIn PDF document text
- http://richmore.kr/uploadfile/fckeditor/file/wuduv.pdfIn PDF document text
- http://rc-modeller.se/images/file///59568675510.pdfIn PDF document text
- https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9641906efb---zinoxezizado.pdfIn PDF document text
- http://beateromer.com/bilder/file/98052077292.pdfIn PDF document text
- https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7ab8150a---piwekuvosuwawakujarak.pdfIn PDF document text
- http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f7667da28---7306571461.pdfIn PDF document text
- https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/8loj5duhtc956ldmubrcn2tqgr/31284759284.pdfIn PDF document text
- https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/725f67e619235cffa58e6d6117f63678/28011304713.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=micra+leadless+pacemakerPDF 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_off0001820c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1820C	10440 bytes
SHA-256: `87530a3250a6289801a72dd2afe89c498872315aa594ab6d8a27a41be061eac1`
`font_01_sfnt_off000199ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x199AC	18852 bytes
SHA-256: `9cf0e8479db0f32db25e82bee1ed091c2728c0c88a896f01d9b02f48ad896f7e`
`font_02_sfnt_off0001ca0e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1CA0E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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