PDF malware analysis — malicious · 898c2fb58140c2b9

MALICIOUS

PDF

85.2 KB Created: 2021-06-25 14:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 5e9c2547af69877ea1c160bef0267a48 SHA-1: 54ddaa03963674360620d6ad70bdcb1744274435 SHA-256: 898c2fb58140c2b92a22e578453ffd5aa0073683ccee0790875137f3b6d7a62c

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_URGENCY_LURE' indicates the document likely uses urgent language to prompt user interaction with these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://laborke.ru/uplcv?utm_term=streaming+spiderman+far+for+home PDF link annotation
- https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/536a1fca3c79206b138125967986a398/76423717701.pdfIn PDF document text
- https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/hfmafjsc6do6ijfk1cc4mteu5a/51359972851.pdfIn PDF document text
- https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/7f804ed1f2819d180774c6ac9668e4d6/mexujutirebibeneka.pdfIn PDF document text
- https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/i634asbv7i71q51p6qf0io25ve/lovupeleramixumevapog.pdfIn PDF document text
- https://ivanamihic.com//files/48017347404.pdfIn PDF document text
- http://yuhenganquan.com/userfiles/file/20210606123706_431747284.pdfIn PDF document text
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609caa66491a6---31335258986.pdfIn PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087b8d7cea74---26571091089.pdfIn PDF document text
- http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/t9obrbu8qf8f581j90rljfhl4u/vepapi.pdfIn PDF document text
- https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/cf0b16ce25c90afa3f2099d23fa22d57/zugogijideweji.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77fe0d928f---98079215239.pdfIn PDF document text
- https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d084c0e41c---savogolid.pdfIn PDF document text
- http://luxmeterthai.com/ckfinder/userfiles/files/siluzunat.pdfIn PDF document text
- http://beijingxinzhi.com/userfiles/file/20210610092154_1551017245.pdfIn PDF document text
- http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/3b0bb7ced1eba13497b62658ab3334c5/kanefemiboduwu.pdfIn PDF document text
- https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/d526df4245321b59987e9ba23e73ef4b/debigulasitojixopaxiw.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_off0000e6a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6A0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000feb7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFEB7	10972 bytes
SHA-256: `0f656d41ec3a3f15b59090ffaa6e0b2f7904e5c6a4831abdc3b9c0dcd0987b69`
`font_02_sfnt_off000117bd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117BD	18200 bytes
SHA-256: `62198cd7ea2b42654e8f8491d4ef0e085caf979a60f391258f5a077e72866134`

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