PDF malware analysis — malicious · 7820fc3f5b444364

MALICIOUS

PDF

83.5 KB Created: 2021-08-26 12:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: b6020ad1b95160d074d8e08d0cdbae72 SHA-1: d441197a036c6e470b1ad29102b50f173fbfeea9 SHA-256: 7820fc3f5b444364c33843c7b8fea844bdd5882d184718641a834369b296e9af

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

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 websites and disposable hosting domains. The embedded URLs, such as 'https://synerhu.ru/uplcv?utm_term=fraction+in+word+document', are likely used to distribute phishing content or download further malicious payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9925

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://synerhu.ru/uplcv?utm_term=fraction+in+word+document PDF link annotation
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c924a3115e4---jovaji.pdfIn PDF document text
- http://eis-pieschel.de/UserFiles/File/73197437538.pdfIn PDF document text
- https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e37dd6cc8---rivufanogiwufuxum.pdfIn PDF document text
- http://eurekaelearning.com/upload/news/file/32263138296.pdfIn PDF document text
- https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/f23652325ad3dc79daa6a196a7ab3daa/vebevijitupebo.pdfIn PDF document text
- https://ddtoyz.com/ckfinder/userfiles/files/vixelekafejufifozuleruf.pdfIn PDF document text
- http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747f0518a11---96606212310.pdfIn PDF document text
- http://geodez.com/pliki/file/tunuzotudijufusom.pdfIn PDF document text
- https://jakspravnenapsa.cz/userfiles/file/zexomokevoganafewumon.pdfIn PDF document text
- https://xigmatek.com/upload/files/xigafigoxud.pdfIn PDF document text
- http://dr-onesrl.com/userfiles/files/pabodesaxenufivolepumaku.pdfIn PDF document text
- http://kingalbertltd.com/uploadedfiles/file/95945316981.pdfIn PDF document text
- https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b4a1eed8d---85273705897.pdfIn PDF document text
- https://ratco-hardware.com/Ups/files/28638818883.pdfIn PDF document text
- https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/nawuvesibalen.pdfIn PDF document text
- http://dakmet.pl/upload/77262732289.pdfIn PDF document text
- https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/dbfd388f6189aafd0dc705e4482b232a/kobumezezumanaxikidiv.pdfIn PDF document text
- https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/87fb035e3761bb6fbf3010e9117ae040/rurigevalivogusafedikagut.pdfIn PDF document text
- http://seoulsquare.com/userfiles/file/zemixaxumibuwipo.pdfIn PDF document text
- https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/0719346bc4653abd524b31da8242d880/7213114635.pdfIn PDF document text
- http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c689f0066---vikoniruxolupogubivur.pdfIn PDF document text
- https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/e52d8c68dd87dfbadc3192a2c9ef72a2/79795579153.pdfIn PDF document text
- https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/4e9c428cf0734277bef07ed933aac172/3430409010.pdfIn PDF document text
- http://cordovajewelry.com/images/file/lokod.pdfIn PDF document text
- https://lensprovn.com/ckfinder/userfiles/files/66127856081.pdfIn PDF document text
- https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9f74986bba23b04ffa241f606794f982/21076936480.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_off0000e48b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE48B	16544 bytes
SHA-256: `c26b7fb6038b231807dac4dccf69cfca154cda86dc65522077eff97c706417ef`
`font_01_sfnt_off00010f8c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F8C	10480 bytes
SHA-256: `4b1695309daec66fa7480f60dadb6f28adf716bca8a7ddb245b5631fc1d2da45`
`font_02_sfnt_off00012767.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12767	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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