PDF malware analysis — malicious · de554367b550cb47

MALICIOUS

PDF

79.7 KB Created: 2021-06-09 07:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01

MD5: f9044f12f78d182e15f1b546aa795919 SHA-1: 338bb5e9959042a3738982f4149f593df21740a3 SHA-256: de554367b550cb47ef0592c1786d175861e1771b7ebdde96395937ddbce7073a

162 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.8894

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
External URI info PDF_URI

PDF contains an external URL action
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://archism.ru/uplcv?utm_term=solucionario+matematicas+3+eso+santillana PDF link annotation
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mqratfg6q8adobn3mk365s8up4/wusanifakibitusawuzitaxib.pdfIn PDF document text
- https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1e614ef7d---2823986113.pdfIn PDF document text
- http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079ebfaa0f85---gemidedujuka.pdfIn PDF document text
- https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975e7c653ba---fejarux.pdfIn PDF document text
- https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/j3mjprjdgkmcag4oqj701am1a3/45165275435.pdfIn PDF document text
- http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160bb19791c3b3---44730322134.pdfIn PDF document text
- https://floraplant.gr/FCKeditor/userimages/file/11753199781.pdfIn PDF document text
- https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e6a291533---27020183899.pdfIn PDF document text
- https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/4827d4f1a29d4fcedc0c470e6ab7d639/55580418929.pdfIn PDF document text
- https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/92542cc49b2fc26ab2a7924a13c86b11/81131039071.pdfIn PDF document text
- http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609434928ebdf---gefidosiboj.pdfIn PDF document text
- https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/39bd64c78ff20e2fd19285f475fe708e/31001562121.pdfIn PDF document text
- https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca79b5c39c---55709216627.pdfIn PDF document text
- https://ph2020.org/FCKeditor/file/65691959620.pdfIn PDF document text
- https://imad0c0.com/js/ckfinder/userfiles/files/5913956284.pdfIn PDF document text
- http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08c178f9f8---zinodusujowodezajul.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://scripts.sil.org/OFLIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e92a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE92A	5096 bytes
SHA-256: `272a170efc91876fc00c0177f4be9f28ebd08abae0a182c5c95d99fc3cd929b6`
`font_01_sfnt_off0000fa47.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA47	1836 bytes
SHA-256: `3502f1f0b14fa6147d40eada058143b5bc63220fa60789d7b8fe7a050703c5db`
`font_02_sfnt_off00010348.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10348	12040 bytes
SHA-256: `c6729e695cc24680b0f939d5b04556793e0f6247feb9b7f79bd1e1dee85c21f9`
`font_03_sfnt_off00012a04.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A04	16204 bytes
SHA-256: `a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd`

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