PDF malware analysis — malicious · f127c4159b003176

MALICIOUS

PDF

86.6 KB Created: 2021-08-30 11:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 4ba752e98be7bc3fbe698f9503af450a SHA-1: 45727a4202b338de7f3443ad6727e847efadd2d1 SHA-256: f127c4159b0031769565d311b441828bf28f4e77b1a4ea5d02877c1c5e05f706

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This 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, suggesting it functions as a link farm. The primary goal appears to be directing users to external malicious websites, likely for phishing or further malware delivery.

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://zhizhencn.com/filespath/files/20210818104639.pdf In PDF document text
- https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c25955c2f---rakarorosudogu.pdfIn PDF document text
- http://wdnederland.nl/file/43256067991.pdfIn PDF document text
- http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/11075901582.pdfIn PDF document text
- http://lynhuagiasi.com/Images_upload/files/58911109736.pdfIn PDF document text
- http://ikra-ekb.ru/files/fckeditor/file/megewusalovibofenosor.pdfIn PDF document text
- https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/562baica8emf4bpldqbrrqqkfj/25395871208.pdfIn PDF document text
- http://jarosi.hu/files/file/71136847956.pdfIn PDF document text
- https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f55c05fcc8---gitolijelodup.pdfIn PDF document text
- https://sonntag-immobilien.lu/userfiles/files/juvuronapenax.pdfIn PDF document text
- http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/jugonuxujirok.pdfIn PDF document text
- http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2db998467---wozibodefigaletojux.pdfIn PDF document text
- https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3kipfg3jb6oh79lho6krabvjoj/tenodivazapejukobinopab.pdfIn PDF document text
- http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7ff4403fb---30567473945.pdfIn PDF document text
- http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e310fd27db---9669912806.pdfIn PDF document text
- http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16076a307cb6a5---tomufeluletuganuzujirur.pdfIn PDF document text
- http://ypperfect.com/ckfinder/userfiles/files/tabotovotakilojulaxajig.pdfIn PDF document text
- https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/0e6b100ed3700f64d9dc872661b1dd58/wopaxalevaluregapubow.pdfIn PDF document text
- https://clubkdo.fr/img/pics/files/37724132509.pdfIn PDF document text
- http://jullien38.com/ressource/site-image/files/9306978540.pdfIn PDF document text
- http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fceaf081c---86772157712.pdfIn PDF document text
- https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ec3b4055---saxug.pdfIn PDF document text
- http://mariekevanvlierden.nl/survey/userfiles/files/vivagukakif.pdfIn PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fc625c84f95---67328369292.pdfIn PDF document text
- https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8086293625---raseruruxewexa.pdfIn PDF document text
- http://yfatc.com/userfiles/file/kefegobul.pdfIn PDF document text
- https://kenhquangcao.vn/uploads/files/13161104578.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=jessica+simpson+and+britney+spearsPDF 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_off0000e9a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9A3	18804 bytes
SHA-256: `c71e6daf2bf6102753e7d3f240b9e16463c7e9bd3a030d3412369c6f750b49f8`
`font_01_sfnt_off00011a7a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A7A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013291.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13291	10872 bytes
SHA-256: `f7a3d0af39d58c444ed81032ccee1beceb537c3eb5485daf08a4ec2996dd737b`

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