PDF malware analysis — malicious · 4569fce910f2fff0

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 20:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: cdb076530899bbad8531207703dc57cc SHA-1: acaa78053cbd66d220e5cd336be1be5cd4cfcf04 SHA-256: 4569fce910f2fff0c8a7b6782ef3a068ec9e7c2ca57e1309f6de6fd3200d1c2e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

Heuristics 6

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.
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://smidgel.ru/uplcv?utm_term=2010+buick+enclave+owner%27s+manual+download PDF link annotation
- http://kokocurry.gm/userfiles/file/30610229996.pdfIn PDF document text
- https://nevisnews.com/userfiles/dipibukalixizalapamo.pdfIn PDF document text
- http://www.nagsa.es/ckfinder/userfiles/files/vafodu.pdfIn PDF document text
- http://edanieltour.com/FileData/ckfinder/files/20210724_5CBF5AA0937AC30E.pdfIn PDF document text
- http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df4ca8440c---5985589511.pdfIn PDF document text
- http://homeopathyhongkong.cn/files/42459197523.pdfIn PDF document text
- https://searchkar.com/ci/userfiles/files/telumukexim.pdfIn PDF document text
- https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/08bafb6f89595f6ae5268ae824fd5d56/89680302428.pdfIn PDF document text
- https://daotaolaixesontay.com/uploads/file/vakovulesisirunabodaw.pdfIn PDF document text
- http://timebank.ru/sites/default/files/photos/pagefile/pidakab.pdfIn PDF document text
- https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/53636642d1c10c1006dc0c79e8d34020/kigapiruxon.pdfIn PDF document text
- https://hojoairport.com/images/file/50570523468.pdfIn PDF document text
- https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b70f278e0a7---rofowuso.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ee002e0b516---jaragilukuwasakusu.pdfIn PDF document text
- http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ad417bed7---zuweno.pdfIn PDF document text
- http://architettoangeli.it/userfiles/files/zinifaxe.pdfIn PDF document text
- https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/fb809bddafb36b9911c11b366b8e3458/70238922964.pdfIn PDF document text
- https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/3b1ec9f11d7623c44ef9145c584a14d9/96077305679.pdfIn PDF document text
- https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/4e9c40a90a5b82b8c3288da1350cf479/20306555865.pdfIn PDF document text
- http://fautographie.org/images/userfiles/files/lekitumuzegox.pdfIn PDF document text
- http://gwardiajuvenia.pl/zdjecia/fck/file/2670307901.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pu429o5cjlfsbq0bs51hjmenr1/vejaxuxafan.pdfIn PDF document text
- https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/ed78d255ae4fd2adcbd8e6f0ee4008c7/20552665749.pdfIn PDF document text
- http://www.nagsa.es/ckfinder/userfiles/files/nebivufuxofapoluzik.pdfIn PDF document text
- http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/99965368390.pdfIn PDF document text
- http://isagenixmakessense.com/ckfinder/userfiles/files/80922328498.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_off0000e010.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE010	18704 bytes
SHA-256: `d731328339857550e745f09113a7e5785e824a89d2b71f0d47ff983c1afa4059`
`font_01_sfnt_off000110e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110E7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000128fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128FE	11148 bytes
SHA-256: `86c739db0af22c32a1da36c52b519b68db64fbf612619bd05965f1dadf27ec37`

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