PDF malware analysis — malicious · c3e5dabc1b98ffa8

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 02:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 9f7cffd86e6229d179e9933470aea869 SHA-1: 7bcc7b8cac146077bd8f8c8e19ca85a8dbb8f0d5 SHA-256: c3e5dabc1b98ffa85ade0fdf92a349c369691234a1835e8caf5a4a2076f94f4d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

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://oniceh.ru/uplcv?utm_term=hosanna+praise+is+rising+sheet+music+pdf PDF link annotation
- https://kvizek.hu/ckfinder/userfiles/files/lezisawuzo.pdfIn PDF document text
- http://xn--xhq021fvrwdth.com/d/files/36508387978.pdfIn PDF document text
- https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de236d980c---61893714851.pdfIn PDF document text
- http://wecans.net/_UploadFile/Images/file/56413223474.pdfIn PDF document text
- https://majorsagilekvaros.hu/uploads/file/vodujujud.pdfIn PDF document text
- https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/fe66e8815712ff573dd95b2394d0d940/62734556974.pdfIn PDF document text
- http://araonline.hu/uploads/file/38239250139.pdfIn PDF document text
- https://kenhquangcao.vn/uploads/files/nogemeredonaxawuxatowira.pdfIn PDF document text
- http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/c088b511e10907f34eda883bfe9303d0/95609219243.pdfIn PDF document text
- http://byecook.com/ckupload/files/fifigogi.pdfIn PDF document text
- http://alteanetworks.fr/img/file/jomobuv.pdfIn PDF document text
- https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/c060fb846995f3c4d4a4fc4f7d771d61/lefubikalikipe.pdfIn PDF document text
- https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dae50aa4ff4---robatuxexime.pdfIn PDF document text
- http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a431d7614eb---wevedaxoxevegasugomekiz.pdfIn PDF document text
- https://dermatologie-chamonix.com/userfiles/file/denixuvuduvugiduson.pdfIn PDF document text
- https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a76122ed9840f10cfcd0a0d80e8d8f09/zoxekij.pdfIn PDF document text
- http://anhbanglaw.com/userfiles/file/ledidetuwapulasax.pdfIn PDF document text
- http://oticonshop.com/ckfinder/userfiles/files/58075093977.pdfIn PDF document text
- http://mobiliteit.nu/files/36718293826.pdfIn PDF document text
- https://walkandsmile.com/userfiles/file/degilufatijefirasub.pdfIn PDF document text
- https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa613bbb79---munawumoxilusukimove.pdfIn PDF document text
- http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09723dcb60---375611946.pdfIn PDF document text
- https://southafricapools.com/contents//files/texiwuvadabibukodidenujix.pdfIn PDF document text
- https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c13467dc0---mobabirelube.pdfIn PDF document text
- https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c19c12e71a9dd2435c33a4c944d3dd7a/moximopazivewomujanebuvav.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607addd92f3fe---13765821163.pdfIn PDF document text
- https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075699439e27---88344021550.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_off0000cc55.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC55	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e467.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE467	19204 bytes
SHA-256: `ea4cf77db0a4e62152189f87ad58ff63230f9a70fcd767fcc1dc1de28401b560`
`font_02_sfnt_off0001164c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1164C	11112 bytes
SHA-256: `5501d0e2b5bf61cd0f44b9bad42338d5b619d9db4beeb1f6aee10760a11dde59`

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