PDF malware analysis — malicious · fdf1722ac6babf8b

MALICIOUS

PDF

85.3 KB Created: 2021-09-17 17:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 40a8071f8a6d8212c4843d6625f1c8ea SHA-1: 6c178f4e1a26a85eacd553209f0af2fcac34c5da SHA-256: fdf1722ac6babf8bc34740e34b20d46c60a568cf14be991e5e79964fc73ecefb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to external resources, many of which are hosted on compromised or disposable domains. The presence of 'utm_term' parameters in some URLs suggests a phishing or SEO manipulation attempt to lure users to malicious content. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution vector.

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 https://pixomot.ru/uplcv?utm_term=jackson+electrodynamics+2nd+edition+pdf PDF link annotation
- https://by-express.com/upfiles/editor/files/71739538331.pdfIn PDF document text
- https://soosekszer.hu/upload/files/86137512536.pdfIn PDF document text
- https://bozoklar.org/ckfinder/userfiles/files/8119969087.pdfIn PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j91dal00gul44utepq365o3vd1/pikasevotit.pdfIn PDF document text
- https://sofahatinh.com/upload/files/17132844615.pdfIn PDF document text
- http://fcv-bo.org/data/fcv-bo/userfiles/file/tubarusibemuwevozujitetus.pdfIn PDF document text
- http://vasvaripalmuzeum.hu/upload/file/nemopowogakade.pdfIn PDF document text
- http://ty-int.com/files/files/gikawonakokumulozapade.pdfIn PDF document text
- https://bodegoncriollo.com/userfiles/file/3425511693.pdfIn PDF document text
- http://vilocom.net/webroot/img/files/46039006142.pdfIn PDF document text
- https://alstar.uz/images/shared/file/3109768215.pdfIn PDF document text
- http://gzky.cn/dubeite/ckfinder/userfiles/files/20210906_015342.pdfIn PDF document text
- http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1613673d680a46---riwilaso.pdfIn PDF document text
- https://n-zvuk.ru/upload/file/74346421029.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/83425603050.pdfIn PDF document text
- https://rimi.sk/userfiles/file/givarubifuvatojeruso.pdfIn PDF document text
- https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/18300eb0713f87c2653080c179a0fe6f/muzibanoteboxeguf.pdfIn PDF document text
- https://joebalogh.ro/imagini_ws/51946628922.pdfIn PDF document text
- http://mygotour.com/FileData/ckfinder/files/20210912_9BF05E3F3CCDFEC7.pdfIn PDF document text
- https://sergeca.com.ve/ckfinder/userfiles/files/97430587185.pdfIn PDF document text
- http://stringquartet.biz/web/images/fck/file/lexakevujijugujotekudunor.pdfIn PDF document text
- http://chonburi33.com/userfiles/file/falinekofopimivaw.pdfIn PDF document text
- http://babijie.com/upload_fck/file/2021-9-9/20210909131223136697.pdfIn PDF document text
- http://votava2.altrodesign.eu/ckfinder/userfiles/files/12295686039.pdfIn PDF document text
- http://kyochonbuenapark.iorderfoods.com/uploads/files/931676194.pdfIn PDF document text
- http://s250801404.onlinehome.fr/img/uploaded/file/13923310377.pdfIn 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://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_off0000e6db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6DB	11100 bytes
SHA-256: `af8f12ef72a8a813d3f8c551520e56f4bf367af16ac76508557441f9d390c7cf`
`font_01_sfnt_off000100e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100E2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000118f4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x118F4	17628 bytes
SHA-256: `e4cd4a83f8437fee48d9986aad4a2358b5e62f4d813a0ce5c4d5eb8314f01a65`

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