PDF malware analysis — malicious · e4f7ae97c27cbf5d

MALICIOUS

PDF

82.7 KB Created: 2021-10-06 17:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: a40738d5238d9ba96e69fce3303bd7a4 SHA-1: 3431c01e61aad645cbcc8b9785e7a7601e66d7a6 SHA-256: e4f7ae97c27cbf5dec1c6c422cbaadfb9da056818eac6dc8f8934046c056f725

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are indicative of a spearphishing attachment, designed to trick users into visiting malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145061730ac2---35503802407.pdf In PDF document text
- http://caopump.com/admin/userfiles/file/xubigenuda.pdfIn PDF document text
- http://jedzenie365.pl/ckfinder/userfiles/files/72779445029.pdfIn PDF document text
- http://xn--k1akb4c.xn--p1ai/userfiles/file/buwadopupelumi.pdfIn PDF document text
- https://irepairplus.nl/app/webroot/files/userfiles/files/35319281525.pdfIn PDF document text
- http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/96453dd136e70ebbb2523171648c4310/fufezezaboredaxedisoraxek.pdfIn PDF document text
- https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4d14bfa48a670fdeab89cd1d5ca6f85c/xivos.pdfIn PDF document text
- https://hram-uspeniya.ru/ckfinder/userfiles/files/divusog.pdfIn PDF document text
- https://silverlabpupsforsale.com/userfiles/files/kazazukugib.pdfIn PDF document text
- http://7sate.com/filespath/files/20210906044823.pdfIn PDF document text
- https://thietkewebseo.com/webroot/img/files/xobepemojab.pdfIn PDF document text
- https://ximatinhdongnai.com/app/webroot/files/images/pages/files/mibesiziwazivavisoso.pdfIn PDF document text
- http://njchemland.com/upload/files/2172151542.pdfIn PDF document text
- https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/7e858372d31f07d615d0b4df7be994c8/74386631261.pdfIn PDF document text
- https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/17e625076f143d2c896d8120bff9d708/kaxusulujegawomazade.pdfIn PDF document text
- http://zaun-produzent.de/userfiles/file/xuxasavedapupezepotogak.pdfIn PDF document text
- http://tcsklife.com/filespath/files/20210916204851.pdfIn PDF document text
- http://jun-travel.com/userfiles/file/kumukanuwutedop.pdfIn PDF document text
- http://inter-travel.hu/_user/file/kulerexonizabubitix.pdfIn PDF document text
- http://daehwa.info/uploaded/file/75734850663.pdfIn PDF document text
- http://xinghui.co/upload/ckimg/files/202109212236212178.pdfIn PDF document text
- https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/246f38eed873da35e8355b6e90b06a65/vezevifa.pdfIn PDF document text
- http://kiapelhrimov.cz/UserFiles/File/tegexibemetolujeti.pdfIn PDF document text
- http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210903180525.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+design+cars+like+a+pro+tony+lewin+pdfPDF link annotation
- 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_off0000d8ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8EE	19084 bytes
SHA-256: `c9ca6a4e73aa6ce2980afe11a5355cbd1542927086a534c98c30cea051a58f53`
`font_01_sfnt_off00010ae7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AE7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000122fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122FE	11080 bytes
SHA-256: `d2716a43f198bf78dca21d4899afb310681105afbe945b21cbdd31edd64232e0`

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