PDF malware analysis — malicious · 3863227262e86521

MALICIOUS

PDF

86.4 KB Created: 2021-09-12 20:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: dd501a30f9270fbbcfcd1a110a90188d SHA-1: fca1360b38e85f0e359432784ccebd8e3565093d SHA-256: 3863227262e86521dcca4e95ad25fcde49d4a6df8b8661fb32a0b8992a63fc5c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=operation+android+app+market PDF link annotation
- http://olsztyntransportmedyczny.pl/userfiles/file/93548231435.pdfIn PDF document text
- http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/bogajuduvaninud.pdfIn PDF document text
- http://samtle.net/ckupload/files/tufur.pdfIn PDF document text
- http://szkolaprzybranowo.pl/ckfinder/userfiles/files/1211601880.pdfIn PDF document text
- https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d345fa3650cc2e32681e2f3942c0ae27/zamaragowidosazodatekuko.pdfIn PDF document text
- http://borik.customreal.sk/data/files/tunupitasevujekesasoti.pdfIn PDF document text
- https://prosaison.fr/userfiles/files/fovixurapuxuteki.pdfIn PDF document text
- https://soalmatematik.com/userfiles/file/koxesife.pdfIn PDF document text
- http://cluboutletmoto.net/campannas/file/netetemufopunixatigawox.pdfIn PDF document text
- https://www.aaptuk.org/ckfinder/userfiles/files/26190396117.pdfIn PDF document text
- http://mecateengenharia.com.br/ckfinder/userfiles/files/veribijadirif.pdfIn PDF document text
- https://yenhuy.vn/upload/files/78656829309.pdfIn PDF document text
- https://ntpuvoice.com/ckfinder/userfiles/files/30115294445.pdfIn PDF document text
- https://inverpalmas.com/aym_image/files/raduvudetirimuzefo.pdfIn PDF document text
- http://zhouzhuank.com/v15/Upload/file/2021911750464178.pdfIn PDF document text
- https://sklep-pinokio.pl/web/uploads/files/71048405742.pdfIn PDF document text
- http://studio-castiglioni.com/userfiles/files/64088719192.pdfIn PDF document text
- https://riwg.in/userfiles/file/gigixotu.pdfIn PDF document text
- https://oncallanatomist.org/ckfinder/userfiles/files/turar.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc0e101ea3---63078153584.pdfIn PDF document text
- http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2c1dbdef5---5235304371.pdfIn PDF document text
- https://hazeloyun.com/calisma2/files/uploads/rotepufokewunofitabugubi.pdfIn PDF document text
- https://sealand-pptc.com/userfiles/file/tezoferusoworaxofuvowame.pdfIn PDF document text
- https://makenie.com/upload/files/34880831274.pdfIn PDF document text
- http://xahuaheng.cn/userfiles/file/15188843122.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_off0000eef9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEF9	17796 bytes
SHA-256: `ca42bfe6131e179c21c479122ee48cf1cc9c38b191eed246a7b1162af7160e8c`
`font_01_sfnt_off00011d75.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D75	10456 bytes
SHA-256: `f0b7d5cc26f74c4a61257bd3a5985442053fe58d19db566662a0f0ec81de1be5`
`font_02_sfnt_off00013528.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13528	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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