PDF malware analysis — malicious · d1bd9720aa0028af

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 04:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: eb586ec3e66ad358312503431de5f50c SHA-1: bbb26370a8fab3a357f53122725c5076f6f80ff9 SHA-256: d1bd9720aa0028af25facdcd0bd72c5f28964009ccedd307acb03e8105275afe

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to redirect users to potentially harmful external content.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://coretry.ru/uplcv?utm_term=android+usb+data+transfer+not+working PDF link annotation
- https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/92679567053.pdfIn PDF document text
- https://cancelaria.pl/galeria/file/nukokilu.pdfIn PDF document text
- http://iltorg.ru/upload/file/2073824925.pdfIn PDF document text
- http://bptramptour.pl/files/file/vuselupanumokulukupukobo.pdfIn PDF document text
- http://dgkno.cn/upload/givapugaxetosorab.pdfIn PDF document text
- http://biosite.ru/images/news/file/91783310331.pdfIn PDF document text
- https://irisapp.cn/uploadfiles/fckeditor/20210910/file/16312281297787.pdfIn PDF document text
- https://mailing.crpm.ch/ck/ckfinder/userfiles/files/69115113269.pdfIn PDF document text
- http://lednotice.com/userData/board/file/71776212681.pdfIn PDF document text
- http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613545e289f1b---16874916821.pdfIn PDF document text
- https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bb48cb868---67386654672.pdfIn PDF document text
- http://showpalmedical.com/userfiles/7599910406.pdfIn PDF document text
- http://kurier48.pl/files/userfiles/file/87577429558.pdfIn PDF document text
- http://dnt-mayak.ru/content/File/92818659544.pdfIn PDF document text
- http://rfinshaat.az/userfiles/file/suxesoduvonawimasiwalu.pdfIn PDF document text
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613010226d1c3---61587214452.pdfIn PDF document text
- http://chugguwang.com/files/fckeditor/file/60740616963.pdfIn PDF document text
- http://www.maderas-navarro.com/ckfinder/userfiles/files/xidubodarezigi.pdfIn PDF document text
- http://ifa-astrologie.de/userfiles/file/rojisunorasopibek.pdfIn PDF document text
- https://bilalyapidekorasyon.com/userfiles/file/44695208409.pdfIn PDF document text
- http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/kavajokubirugom.pdfIn PDF document text
- https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/70f79ad050cfc23c825b6aefd6681e04/41122944542.pdfIn PDF document text
- https://allegypttours.net/userfiles/files/14680655969.pdfIn PDF document text
- https://immo-cjeanpaul.lu/userfiles/files/39434556058.pdfIn PDF document text
- http://aaykpn.com/uploads/editor/files/xomozapowinugipub.pdfIn PDF document text
- http://dynamicyunnan.com/ckfinder/userfiles/files/9720325938.pdfIn PDF document text
- https://leise.ru/admin/ckfinder/userfiles/files/93093198728.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_off0000e047.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE047	10884 bytes
SHA-256: `c58665539d51fd7c8243c0de9d78db56cb7b2591c8220b29777cc28f3a698246`
`font_01_sfnt_off0000f981.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF981	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011193.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11193	17328 bytes
SHA-256: `10c589190c4ef2f86503b8898da60bd3a9956a63bba53d95baafbb0a962cb99e`

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