PDF malware analysis — malicious · 10f4db243a05cf0e

MALICIOUS

PDF

90.3 KB Created: 2021-09-18 18:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: c27b36f08335ef3260c873646fae6486 SHA-1: b8ddd83cb9ac51056fcc041b7c0f9d4e5d34514c SHA-256: 10f4db243a05cf0e31c0fa6715fefc35cd8b8375e98075d179ce8a4d33c35bb6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=200+trillion+in+numbers PDF link annotation
- http://oshcongregation.com/userfiles/file/83369383701.pdfIn PDF document text
- http://ymjgolf.com/file_media/file_image/file/mutisekevebakexawegu.pdfIn PDF document text
- http://brilliantsolarpaneling.com/userfiles/file/60896361446.pdfIn PDF document text
- http://jngf.cn/files/file/novapatukafixi.pdfIn PDF document text
- https://weishinclinic.com/uploads/files/202109130927303997.pdfIn PDF document text
- https://foursservices.com/nbloom/fckuploads/file/jozakokabidibexekivoziru.pdfIn PDF document text
- http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c8a1c7a8b4a464c20498a7e5c0b8159a/26905565215.pdfIn PDF document text
- https://homeuu.biz/upload/ckeditor/pages/files/mekubebatixivel.pdfIn PDF document text
- https://foodphotoshop.com/userfiles/files/difupawasuxuwegivozeri.pdfIn PDF document text
- https://tradingphrases.net/userfiles/files/liwuxibadupu.pdfIn PDF document text
- http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210902172104.pdfIn PDF document text
- http://como.gattinonimondodivacanze.it/themes/userfiles/files/48964787579.pdfIn PDF document text
- http://centrons.com/uploaded/file/94325672661303d8b19575.pdfIn PDF document text
- https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1f08dfe26414759f19330518ed2c3fa3/pewaxo.pdfIn PDF document text
- http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6e008bb30---26900958456.pdfIn PDF document text
- https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/rifomekuril.pdfIn PDF document text
- https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138eace0ed4a---xunitivebabivegoniba.pdfIn PDF document text
- http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb0b09428---datafupetetip.pdfIn PDF document text
- http://baoveantam.info/upload/files/49360335712.pdfIn PDF document text
- http://cegled.varosom.hu/userfiles/files/rimivopo.pdfIn PDF document text
- https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/e8febfdbb90df4935f955a317a400c83/jeziwojavusajaw.pdfIn PDF document text
- http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6607080250.pdfIn PDF document text
- http://land89.com/ckupload/files/motemig.pdfIn PDF document text
- http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144c81a84e12---voxajat.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_off0000e37b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE37B	18088 bytes
SHA-256: `39a04cd70f156420e437172c710418424bdbf376a1e3a3d2bbc21b4494b4df0c`
`font_01_sfnt_off000112c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112C7	18776 bytes
SHA-256: `06b126add2ec1e5ba51fafb48514c934b34f723807b1f5661846a16f178a68d9`
`font_02_sfnt_off00014363.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14363	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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